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09-20-2010, 05:23 PM
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Biofinity vs Proclear
Hello,
Nice forum, I have learned a lot recently reading around here and now I have a question to all of you I couldn't find an answer: It's there any advantage in using Biofinity instead of Proclear (comfort, health, etc.) if I'm not interested in extended wear? I like a lot Proclear because it really helps to avoid the dry eye feeling under dry conditions like a/c but I don't know if there's any special reason why I should move to Biofinity. 
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09-20-2010, 05:42 PM
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The most obvious benefit in the Biofinity lenses is that they are a third generation silicone hydrogel lens (Comfilcon A), which has a very high oxygen permeability - usually expressed as Dk. The Dk value for Comfilcon A is 128. In contrast the Proclear lenses are made of omafilcon A which is a hydrogel lens with a Dk value of 33, which is good for a hydrogel lens, but low compared to the silicone hydrogel material. High oxygen permeability in the lens allows your cornea to receive more oxygen (it has no blood vessels and must draw it's oxygen from the surrounding air and the tear film). Impermeable or low Dk lenses make this more difficult. I have worn the Biofinity lenses and found them exceptionally comfortable. knotlob
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09-21-2010, 08:54 AM
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Like knotlob said, the high Dk value of Proclear lenses makes them very comfortable to wear all day.
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09-21-2010, 10:51 AM
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Thanks both for your answers.
The thing is I've been using Biofinity for over a month, I work everyday 8+ hours with a/c and the end of day comfort for Biofinity sometimes has been better and sometimes worst than Proclear (the best I used for dry conditions). I already ordered some Aquify Long Lasting drops to see if it helps a little on those days that Biofinity gets dryer and I'm using right now Opti Free Replenish and it seems to help too, because before with Renu Fresh the lenses were getting more uncomfortable. I recently saw and read about the new Renu BioTrue and it looks interesting, maybe I'll try it after running out of my current solution; which one do you think should work better with this lenses? Quote:
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09-21-2010, 12:16 PM
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09-21-2010, 01:07 PM
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 .knotlob
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09-21-2010, 03:10 PM
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10-20-2010, 07:42 PM
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Hi guys, I'm new on this forum. Ffirst of all you have to excuse my poor english, I speak spanish.
I'm about to buy new lens, and two of those i'm interested in are PROCLEAR and BIOFINITY. The other one is Biomedics XC. What do you think? I was using Biomedics 55 evolution and I'm not confortable with them. They get dry really fast, even if i put some artificial tears in my eyes, they lasts less than half an hour. i read that those 3 brands has more water so they last more time wet, but which of them are better? The data of the one i was using is D-2.50 bc 8.6 dia 14.2. THANKS!
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10-21-2010, 04:34 AM
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.Biomedics 55 (Ocufilcon D, Dk 19.7, H20 55%) - uncomfortable for you Biomedic XC (Omafilcon A, Dk 33, H2O 59%) Proclear (Omafilcon A, Dk 33, H2O 59%) Biofinity (Comfilcon A, Dk 128, H2O 48%) The first three lenses are rather old technology and have low Dk values. The Dk is the amount of oxygen that the lens material can pass through to the cornea of the eye and keep it health and well supplied with oxygen. The Biofinity lens is a newer silicone hydrogel lens material called Comfilcon A and is about 4 times more oxygen permeable than the other three lenses. Biofinity lenses (for me) are very comfortable, though they have a higher moisture content (48%) that most of the other silicone hydrogel lenses around at present. Generally, the lower the moisture content of the lens material, the less will be the drying of the eye (by the lens loosing water by evaporation). I would recommend you try the Biofinity lenses and see how you get on. If these don't work for you, try another silicone hydrogel lens with a lower moisture content. Bye the way, when you ask a new question, it is better to start a new post under this Biofinity section, rather than add it onto an existing post (hijacking). That way, the forum is tidier and your question will be seen and hopefully answered quicker .knotlob
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10-21-2010, 09:01 AM
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Thanks for the "hijacking" information too. I've seen it happen once or twice here on Lens 101, but I didn't know there was a name for it.
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10-21-2010, 12:11 PM
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Actually, we are scattered all around the world.. I'm from SouthAm, Argentina Yes I know I should have started a new thread but I didn't know where, and I found this question that matched with my doubt and wasn't old. Can you clarify me something about the water percentage and the DK? higher DK is better and higher H2O% is better too? Which is "more important" ? I mean I thought that the more H20%, the more time the lens will keep wet, am I wrong? So if I have lens that are 55% and i turn into ones that have 48%, wouldn't they get dry faster? At better DK, your eyes will "breath" better, but would it feel better for someone who doesn't have troubles with a lower DK as me? 'cause I don't think that the uncomfortable feeling is because of DK but because they just get dry so fast. Thank you a lot!
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10-21-2010, 02:00 PM
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10-21-2010, 02:05 PM
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Do you have a good relationship with your eye practitioner? I'd ask for trial lenses for both biofinity and proclear. He might suggest putting one proclear in one eye and biofinity in the other.
Manufacturers are happy to supply trial lenses. Take advantage. Knotlob is very knowledgeable but there is no substitute to seeing how the lenses feel/work in your eyes.
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10-21-2010, 03:47 PM
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Biofinity or Proclear?
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10-21-2010, 04:50 PM
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Sorry, I wasn't thinking broadly when you said you spoke Spanish. Anyway, your from Argentina (where they make some coloured contacts Waicon, I think). Lurker2010 has made a very good suggestion. Your Eye Care Professional (ECP) will probably be inundated with packs of trial contact lenses from the manufacturers, so see if your ECP will trial you with some lenses - for free. Anyway, I will try to clarify the water/Dk issue for you, as I understand it. Before silicone hydrogel lenses were developed, contact lenses were made of HEMA hydrogel. With this material, the higher the water content, the more comfortable the lens was and also the higher the oxygen permeability. Oxygen moved through the lens using the water molecules in the gel. Then came silicone hydrogel lenses. These offered much higher oxygen permeability with figures up to Dk 140 or so. HEMA hydrogel lenses are normally Dk 10-35 or so, but in theory could have a Dk of up to 80 maximum, I think. The oxygen transfer in silicone hydrogel lenses is via the silicone molecule in the gel. No water is needed for the oxygen transfer, though the lenses generally contain some water. But, silicone is hydrophobic/water repelling, so a pure silicone gel lens would be very uncomfortable. Some manufacturers treat the surface of the lens with a plasma coating to add or convert the silicone to silicate, which is more water loving. Some manufacturers add wetting or conditioning agents to make the lens more comfortable/wettable/hydrophilic/water loving, but sometimes these chemicals cause adverse/allergic reactions in sensitive eyes. RGP lenses don't contain any significant amounts of water and are often recommended for people with dry eyes. But they tend to be less comfortable for some wearers, though offering better vision. One of the current theories is that a high water content lens will loose water from it's gel by evaporation to the surrounding atmosphere. Gels don't like loosing moisture, so will try to make up this water by drawing water from the eye. As a result, the eye feels dry and uncomfortable. So a lower water content lens is often better for people with dry eyes. Biofinity lenses are a special case with higher water content for comfort, but probably not so prone to drying the eye. This is one lens you really should trial. High Dk is not everything, but one of my eye doctors believed that the best (silicone hydrogel) lens materials are only just good enough for your eyes. If you insist on wearing an older HEMA hydrogel lens with low Dk, then you will need to be careful not to wear the lens too many hours/day, otherwise your cornea may become short of oxygen and neovascularisation may develop. This is the growing of capillaries/blood vessels into your cornea (which normally is without these and must be clear of these for good vision). knotlob
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10-21-2010, 09:50 PM
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In this case, I'll go for a Biofinity, unless I find other supplier that sells Proclear for my need. But if I am totally compatible with the biomedics55 evolution (that are the cheapest ones), shouldn't I feel obviously better a Biofinity lens?
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10-21-2010, 10:07 PM
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Yes, here we have the Waicon Labs that makes contact lens. I used to buy them the NEW LENS by Waicon. Uncolored, just for myopia. And I don't know, I wanted to try CooperVision that is cheaper but "last the half of the time than new lens lasts". Idk if it's real or not, but thats what specifications says. So they sold me the Evolution 55, I used them a year (2 boxes, each pair lasted me 2 month..... recommended by the seller) , and now I want to try sth better. And I didn't find better lens by Waicon. So i'mg going for CV. By the way, the Biomedics gave me better view resolution than new lens did. I wanna ask you sth, maybe you know about this. There is an issue suffered by myopics as me where, if youre seen a bright thing like a screen or a white wall, you can see some "black flies" or things floating in the air that I have read that it is normal because of the bad (short) focus of the eye, and what u re seeing is the veins inside the eye, or normal retinal detachment... Might it have a relation with a bad oxygenation because of contact lens? Or the first thing you see in those cases are the red veins on the white of the eye? thanks!
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10-22-2010, 02:47 AM
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I think you will find the Biofinity very good, though they are quite thin for a Monthly lens and you need to handle them with care. The 'black flies' you see sound like floaters in your eye. Some floaters are normal and you just learn to ignore them. But large, numerous or a sudden increase in floaters can indicate serious problems such as retinal detachment. I don't know if there is such a thing as normal retinal detachment. I have some neovascularisation, which is no longer active. The blood vessels in the eye are empty and called ghost capillaries. Probably happened when I was wearing hard PMMA non oxygen permeable lenses many, many years ago. I don't think you can see neovascularisation yourself, but your eye care professional will see it during the annual eye care examination. You should discuss the floaters with the eye care specialist to reassure yourself that everything is OK/normal. knotlob
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10-22-2010, 09:30 AM
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11-02-2010, 04:32 PM
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Why Does AC Do That?
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11-02-2010, 05:06 PM
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Air contains moisture. The maximum amount of moisture is can support increases with higher temperature. Large bodies of surrounding water will increase the amount of water that the air can hold for a given temperature. When that air has absorbed it's maximum water content, the air is said to have a Relative Humidity of 100%. In the summer time, you folks in the US often have to run air conditioning systems and these air conditioning systems not only cool the air but also tend to deliberately dehumidify/dry the air to some extent, so that the relative humidity of the air leaving the Air Con unit is lower than it would be outside. The laws of chemistry or chemical engineering say that evaporation of water from the eye will be higher when the relative humidity of the ambient air is lower. So in Air Conditioned buildings with low Relative Humidity, there will be a greater tendency for evaporation of moisture from the contact lenses to the surrounding air. Contact lens gel materials don't like loosing moisture, so will draw moisture from your eyes, making your eyes dry and itchy. By the same token, the air inside an aircraft in flight is drawn from outside and is circa -55 Deg C I think, so will contain hardly any moisture. When this air is heated before entry to the cabin, it could absorb a lot of moisture but probably isn't humidified sufficiently and so it's relative humidity is low and again the eyes become dry. I'm not sure why they don't increase the humidity inside the cabin. There must be a valid reason for that - passenger comfort, etc. knotlob Last edited by Knotlob; 11-22-2010 at 05:35 AM..
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11-21-2010, 10:26 PM
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Hey guys! I'm sorry i didn't answer as yet, I was so busy that i didn't have the time to enter here anymore. Some news. I finally bought BIOFINITY. I could get them at a really good price (cost price) around 29U$S. When they are normally around 40USD or more here. So i took the offer. Well, the fact is that I don't feel them so comfortable. They seems to last more time wet (they are new), but it is like they make me feel such nuisance in my eyes when I just put them on. In fact, i had to open 3 of the 6 packs of the box, because there was one lens that i couldn't use, it made my eye ache so bad. And thats strange because it could be that I don't tolerate them well, but why it is just ONE that hurts bad? I'll try to change the box and try with other. Just in case of factory defects. In fact, I looked up for some kind of defect on the lens but i didn't find anything comparing each other. Technically, the only two differences between the lens i was using and Biofinitys are the diameter (I used 14.2 and biofinity are 14.0) thus I couldn't do anything about, and the substance they are made with. But I'm using two lens that, even if they felt uncomfortable at the begining, after 2 days of use they stopped hurting. But... after about 6 hours i use them, i start to feel some kind of uncomfortable feeling, like a heat, in my eyes. So I am a bit disappointed and confused... As I said I'll try to change them and see what happen. Thanks to all for your help!
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11-22-2010, 05:55 AM
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It is possible to have manufacturing defects in lenses. When I first tried them I was given a rebranded lens (which was actually a Biofinity) by the optician as a trial. They were not comfortable, particularly in my right eye, which has a little more astigmatism than the left. Also the prescription was not quite right and unbalanced - I normally have the same prescription in each eye. However, when I bought Biofinity directly from a Mail Order house, they were exceptionally comfortable and I couldn't feel them in my right eye (astigmatism) at all. Is the discomfort you feel with one eye replicated when you put the contact lens from that eye into the other eye? If so, then that suggests a manufacturing fault (within or outside manufacturing tolerances). Do you have any astigmatism? That can cause discomfort, even if it is only mild. If you have discomfort after some time it could also be linked to the solutions. I would recommend you try a preservative free peroxide based system Clear Care/AOSept and see if this improves the situation. I don't think the 0.2mm difference in contact lens diameter will make any difference to the 'feel' of the lenses. knotlob
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11-22-2010, 09:51 AM
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11-22-2010, 11:37 AM
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Anyway the box was closed, the impression on he box is not cheap, on the labels of each package neither, it has lot number, a label with the importer info.. I know it can all be done by anyone, but again it don't seem so cheap to worth. I have just contacted CooperVision to ask them if there is a way to know, maybe with the lot number and anything more. I have a little of astigmatism in my left eye, though I tried to put one of the lenses I'm using on my right eye and it hurt so I'm using it on the eye with astigmatism and feel ok. :/ I don't want to wait a lot of time to test whats really happening because i want to contact now the doctor that sold them to me so he can change them. What did you mean whit re-branded lens? Would be there a way I can buy this lens DIRECTLY to coopervision USA? I say USA just because the Biomedics was for there and they were excellent. These ones don't say where are maid, they just give the addresses from USA and UK. Thanks
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11-22-2010, 12:50 PM
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You could buy the from Lens.com, the sponsors of this site. Just click the red button at the top of the page.
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11-22-2010, 02:44 PM
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Try out some preservative free solutions. Avoid biguanides as well. I had comfort issues when I used Biofinity with solutions containing biguanides (Renu, Amo, most of them really). Alcon ones are a bit better but they still have biguanides, a bit altered but anyway. I would suggest trying out hydrogen peroxide based solutions for overnight lens cleaning. Just check that they are preservative free and remember that you cannot put them in your eyes.
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11-22-2010, 03:37 PM
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11-22-2010, 03:53 PM
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). If your lenses say Comfilcon A on the packet, then they will be Biofinity or the Biofinity lens with a different name. There are lots of rebranded Biofinity lenses on the market, the most common being SiH48. CooperVision allow rebranding of some of their lenses so that some Optician Chains or Eye Doctors can sell them at double the regular price to their unsuspecting clients. Since your lens hurts your eye, no matter which eye you try, it is almost certainly a manufacturing defect. I hope the others in that lot are not similarly off specification. Try the peroxide system to see if that improves your other problem. knotlob
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11-22-2010, 03:54 PM
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11-22-2010, 04:32 PM
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2011
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11-22-2010, 05:02 PM
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They say comfilcon A. I don't think they are "fake", it seems to be a real CooperVision product. What is a peroxide system? is that a solution to save (disinfect) the lenses? I just bought one better than the previous i used to buy (Natura Express, I don't think you even know about it). Better because it has Sodium Hyaluronate "that make the lens stay wet more time and it is better for the cornea". The brand is Natura Confort in this case. If thats what you are talking about, why is better a liquid based on peroxide?
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11-22-2010, 05:15 PM
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I'm sure he'll correct me (gently) if I'm wrong, but I do believe that the "peroxide system" that Knotlob talking about is a thing made by "Clear Care." You put your contact lenses in a little basket and soak them in a peroxide solution which makes them bubble. Here's how All About Vision describes the process: Hydrogen peroxide solution is for cleaning, disinfecting, rinsing and storing your contact lenses. With this product, you place your lenses in the provided basket and rinse them, then place the basket in its cup and fill the cup with solution to clean and disinfect your lenses. Some lens holders for hydrogen peroxide systems have a built-in neutralizer (to convert the hydrogen peroxide to water, so it doesn't sting your eyes), but with others you need to add a neutralizing tablet. After the disinfection and neutralizing step is completed, you can remove the lenses from the case and put them on.
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11-22-2010, 05:18 PM
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Hydrogen Peroxide is a 3% hydrogen peroxide disinfectant in a saline solution. The best one for people with sensitive eyes is one which doesn't contain any preservatives. The peroxide is strong and can kill most of the likely microbial infections, including Acanthamoeba keratitis found in contaminated tap or bathing waters. You soak your lenses in it overnight. The AOSept or Clear Care lens case contains a metal catalyst, which facilitates the destruction of the peroxide (to oxygen and water) over a period of six hours. Then you should be left with a sterile pair of contact lenses in a saline solution, which is compatible with your eyes. Hyaluronate (comfort/wetting agent) is present in quite a lot of lens solutions - especially eye drops that I have looked at. But people's eyes vary and can be sensitive to many different chemicals. AOSept/Clear Care is safer in these circumstances. EDIT: Well LeeRoberts beat me to the reply. Top man . (Hope I got the gender right).knotlob
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11-23-2010, 11:39 AM
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Clear Care Reaction
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Secondly you said that the final result of this process us "a sterile pair of contact lenses in a saline solution." Where did the salt come from?
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11-23-2010, 12:22 PM
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The hydrogen peroxide solution that you buy has salt (NaCl) added to the solution to make it the same isotonic strength as the fluids in your eye. This makes it comfortable when you put the lens in your eye. Otherwise osmotic pressure effects between the different salt concentrations in your tears/eye and the lens solution would occur and cause discomfort/problems. There are sometimes other minor additives like phosphate added to pH buffer or preserve the lens solution, but these are not strictly necessary - I didn't add these when I made up my own peroxide solution and never had any problems. knotlob
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11-23-2010, 12:41 PM
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Well Done
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12-07-2010, 05:42 PM
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12-08-2010, 04:26 PM
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12-08-2010, 04:39 PM
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12-08-2010, 04:46 PM
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It's not a motorcycle, is it? "The new Kawasaki ED50. It doesn't even need a kickstand. Ride one today."
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12-09-2010, 12:47 PM
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So this ED50 chair is not available in stores, huh? It must cost about a thousand dollars. Keep those posts coming, Zenec.
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12-09-2010, 02:04 PM
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12-09-2010, 02:23 PM
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Well, maybe now you can relax in your fancy chair and answer some more questions on this forum. What do you say?
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12-14-2010, 05:46 PM
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What a Bargain
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01-07-2011, 04:48 PM
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What about glasses? Doesn't anyone read the eyeglasses section of Lens 101. Glasses have lenses too, you know.
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