Results 1 to 24 of 24

Thread: Focus Night and Day Has the Highest Dk

  1. #1
    Join Date
    Nov 2007
    Posts
    664

    Default Focus Night and Day Has the Highest Dk

    I heard that Focus Night and Day contact lenses have the highest Dk of any contact lens on the market. I also heard that it's a very stiff lens and not very comfortable. Couldn't they make a contact lens that is comfortable AND has a high Dk?

  2. #2

    Default

    Sorry to seem so aloof.....

    What is DK???


  3. #3
    Join Date
    Nov 2007
    Posts
    664

    Default

    "Dk" is a measure of how much oxygen a contact lens allows through to the cornea. The higher the Dk number, the healthier your eyes will be.
    Sorry, I don't know what the letters "Dk" stand for, though.

    I've been to the South Side of Chicago. Sure gets cold in the winter!

  4. #4

    Default

    Quote Originally Posted by 321contacts View Post
    I heard that Focus Night and Day contact lenses have the highest Dk of any contact lens on the market. I also heard that it's a very stiff lens and not very comfortable. Couldn't they make a contact lens that is comfortable AND has a high Dk?
    The material is stiffer but they are also thinner so they only feel as stiff as say the Acuvu Oasis. When properly inserted I cannot even feel them so they can be very confortable in spite of the stiffness. They also maintain perfect clarity throughout the day & into the night. No halos in my vision around lights which were diconcerting when night driving even after a long day unlike the Oasis contacts which were horrible that way for me.

    They are also very light & don't stick to my finger as well as the oasis when trying to insert them. Some times I've dropped them as many as 5 times trying to position them on my finger to insert in eye which is a minor annoyance but once in my eye these are definately incredible lenses & am extremely happy with them.
    Last edited by germanium; 04-10-2010 at 05:03 AM.

  5. #5

    Default

    which brand of SYLICONE HYDROGEL contact lens HAS THE HIGHEST Dk ???

  6. #6
    Join Date
    Nov 2009
    Location
    near Hamburg, Germany
    Posts
    2,144

    Default

    Quote Originally Posted by rex View Post
    which brand of SYLICONE HYDROGEL contact lens HAS THE HIGHEST Dk ???
    Probably lotrafilcon A as used in Air Optix Dk=140. Comfilcon A as used in Biofinity Dk=128.

    But it depends on the thickness of the lens to calculate the Dk/t, which is more important for eye health.

    The thinner the lens, the better the oxygen permeability. e.g. Biofinity Dk/t = 160.

    Also watch the actual method that the manufacturers quote for the measurement of Dk. There are at least three different methods so it is confusing at times.

    knotlob

  7. #7

    Default

    Quote Originally Posted by bugheman View Post
    Sorry to seem so aloof.....

    What is DK???

    321contacts is correct. Dk is a measurement of how much oxygen gets through the lenses and reaches the cornea.
    Attached Images Attached Images

  8. #8
    Join Date
    Nov 2007
    Posts
    664

    Default

    Quote Originally Posted by Steuhrob View Post
    321contacts is correct. Dk is a measurement of how much oxygen gets through the lenses and reaches the cornea.
    Oh look! Molecules!

  9. #9

    Default Who Put the D in Dk?

    Quote Originally Posted by Steuhrob View Post
    321contacts is correct. Dk is a measurement of how much oxygen gets through the lenses and reaches the cornea.
    That's correct, Steuhrob. Just don't ask why they use the letters "D" and "k." I think someone tried to explain here on Lens 101 a while back and I just got more confused.

  10. #10
    Join Date
    Nov 2007
    Posts
    664

    Default

    Quote Originally Posted by pathfinder View Post
    That's correct, Steuhrob. Just don't ask why they use the letters "D" and "k." I think someone tried to explain here on Lens 101 a while back and I just got more confused.
    Yeah a lot of those formulas and equations that use letters don't always use English words. Just look at E=mc2.

  11. #11

    Default I Agree

    Quote Originally Posted by 321contacts View Post
    Yeah a lot of those formulas and equations that use letters don't always use English words. Just look at E=mc2.
    Yeah, I'm sure D and k are like that.

  12. #12

    Default

    Focus Night and Day are / were the best contacs I ever had. Put them on early in the morning and take them out late at night and you can't even feel that you have anything on your eye. Perfect vision. No problem. I slept in them once or twice but I do not think it is a good practice with an lens, but if you have to do it once in awhile with your extended wear lens, it is okay.

  13. #13
    Join Date
    Dec 2007
    Posts
    600

    Default

    Quote Originally Posted by AA2 View Post
    Focus Night and Day are / were the best contacs I ever had. Put them on early in the morning and take them out late at night and you can't even feel that you have anything on your eye. Perfect vision. No problem. I slept in them once or twice but I do not think it is a good practice with an lens, but if you have to do it once in awhile with your extended wear lens, it is okay.
    Thank you for that glowing report on Focus Night and Day. Did you doctor say anything to you about sleeping in them? I don't think they would call them "Night & Day" if you had to take them out at bedtime.

  14. #14

    Default

    Quote Originally Posted by K-9 View Post
    Thank you for that glowing report on Focus Night and Day. Did you doctor say anything to you about sleeping in them? I don't think they would call them "Night & Day" if you had to take them out at bedtime.
    I'm on my third eye doctor in this crazy town, and all three of them said it's not good to sleep in your contacts. They are designed so you CAN sleep in them, but it's better if you DON'T. So, yes, you can, and some people need that convenience because of their job or lifestyle, and some people just like it, but sleeping in your contact lenses creates a higher risk of eye problems, especially if you do it every day, even if your contact lens is designed for sleeping in.

    I started wearing contact lenses in 1976 so it is not an issue for me to just take them out and put them on, kind of like having to brush my teeth every day.

  15. #15
    Join Date
    Nov 2007
    Location
    Midwest
    Posts
    333

    Default

    Quote Originally Posted by AA2 View Post
    They are designed so you CAN sleep in them, but it's better if you DON'T.
    That's a good way to look at it, AA2. I think that's going to help a lot of people. Still, if I were in marketing, and I knew that it's best not to sleep in contact lenses, I would not have called them "Night & Day." I mean, if I was going to to that, I might as well call them "Sleep in Them" contact lenses.

  16. #16

    Default

    Quote Originally Posted by AA2 View Post
    I'm on my third eye doctor in this crazy town, and all three of them said it's not good to sleep in your contacts. They are designed so you CAN sleep in them, but it's better if you DON'T. So, yes, you can, and some people need that convenience because of their job or lifestyle, and some people just like it, but sleeping in your contact lenses creates a higher risk of eye problems, especially if you do it every day, even if your contact lens is designed for sleeping in.

    I started wearing contact lenses in 1976 so it is not an issue for me to just take them out and put them on, kind of like having to brush my teeth every day.
    So it's "sleep in them if you must, but don't make a habit of it"?

  17. #17

    Default

    Yes. I am so sick of the eye doctor B.S.! I had been forcing myself to use Focus Dailies, which aren't very good, you can FEEL them in your eye, off and on throughout the day, and that's total B.S.

    So I had an opportunity to camp out another night and wore my Focus Night and Days, couldn't feel them, went to sleep at 9:30 as I'd gotten an head cold, woke up many times throughout the night and never EVER EVEN FELT THEM IN MY EYE! I kept them on until I went home to sleep the next night and still, I did not feel them at all, I only took them out because it was time to go to bed.

    WHY can't I have a simple pair of nice contacts I can't feel in my eye NOW? When these are worn out, I don't know what I'll be doing but I am not going to accept wearing Focus Dailies, unfortunately I had bought some already because two eye doctors acted like it's either A or B, Focus Dailies, Air Optics Night and Day, or the OTHER worst contact lens in the world, Acuvue whatchamacallems.

    I am going to be using a VIAL lens next, not sure which one yet and not sure what to do about finding an eye doctor with a brain. Do I have the "right" to wear a lens my eye doctor doesn't SELL?

  18. #18
    Join Date
    Dec 2007
    Posts
    463

    Default You Have Rights

    Quote Originally Posted by AA2 View Post
    Do I have the "right" to wear a lens my eye doctor doesn't SELL?
    Yes, you do. It's called the Fairness to Contact Lens Consumers Act. Here's a part of the Wikipedia article:

    Under the Rule issued by the FTC [Federal Trade Commission], contact lens prescribers - defined as anyone permitted under state law to issue prescriptions for contact lenses, which include ophthalmologists, optometrists, and licensed opticians who are permitted under state law to fit contact lenses (sometimes called dispensing opticians) must give a copy of the contact lens prescription to the patient at the end of the contact lens fitting, even if the patient doesn't ask for it. Prescribers must also provide or verify the contact lens prescription to anyone who designated to act on behalf of the patient, including contact lens sellers. Prescribers are also barred from requiring patients to buy contact lenses, pay additional fees, sign waivers or releases in exchange for a copy of their prescription, or disclaim liability or responsibility for the accuracy of an eye examination.

  19. #19
    Join Date
    Dec 2007
    Posts
    600

    Default

    Quote Originally Posted by coconutoil View Post
    Yes, you do. It's called the Fairness to Contact Lens Consumers Act. Here's a part of the Wikipedia article:

    Under the Rule issued by the FTC [Federal Trade Commission], contact lens prescribers - defined as anyone permitted under state law to issue prescriptions for contact lenses, which include ophthalmologists, optometrists, and licensed opticians who are permitted under state law to fit contact lenses (sometimes called dispensing opticians) must give a copy of the contact lens prescription to the patient at the end of the contact lens fitting, even if the patient doesn't ask for it. Prescribers must also provide or verify the contact lens prescription to anyone who designated to act on behalf of the patient, including contact lens sellers. Prescribers are also barred from requiring patients to buy contact lenses, pay additional fees, sign waivers or releases in exchange for a copy of their prescription, or disclaim liability or responsibility for the accuracy of an eye examination.
    Thanks for reading us the Fairness to Contact Lens Consumers Act, coconutoil.

  20. #20
    Join Date
    Nov 2007
    Posts
    664

    Default

    Quote Originally Posted by K-9 View Post
    Thanks for reading us the Fairness to Contact Lens Consumers Act, coconutoil.
    It sure is better than reading us the riot act.

  21. #21

    Default

    Quote Originally Posted by coconutoil View Post

    Under the Rule issued by the FTC [Federal Trade Commission], contact lens prescribers - defined as anyone permitted under state law to issue prescriptions for contact lenses, which include ophthalmologists, optometrists, and licensed opticians who are permitted under state law to fit contact lenses . . .
    So "anyone permitted under state law to issue prescriptions for contact lenses" is defined as " . . . licensed opticians who are permitted under state law to fit contact lenses . . . "

    That's "legalese" for you.

  22. #22
    Join Date
    Nov 2007
    Location
    Midwest
    Posts
    333

    Default

    Quote Originally Posted by Steuhrob View Post
    So "anyone permitted under state law to issue prescriptions for contact lenses" is defined as " . . . licensed opticians who are permitted under state law to fit contact lenses . . . "

    That's "legalese" for you.
    Yeah. It's also known as "circular logic."

  23. #23

    Default Semantics

    Quote Originally Posted by Anthanxan View Post
    Yeah. It's also known as "circular logic."
    I suppose, although the word "logic" may not apply in this case.

  24. #24
    Join Date
    Nov 2007
    Posts
    664

    Default You Do the Rest

    Quote Originally Posted by Steuhrob View Post
    I suppose, although the word "logic" may not apply in this case.
    [Insert lawyer joke here.]

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
  • Contact Lenses / Contact Lens Forums

    1. Daily Disposable Contact Lenses 2

      1-Day Acuvue 2, 1-Day Acuvue Moist 2, 1-Day Acuvue TruEye, Biotrue ONEday Biomedics 1 Day 2, ClearSight 1 Day, Dailies AquaComfort Plus 2, Focus Dailies 2, Proclear 1 Day 2, SofLens Daily Disposable 2,
    1. 1-2 Week Disposable Contact Lenses

      Acuvue 2, Acuvue 2 2, Acuvue Advance 2, Acuvue Oasys 2, Avaira, Biomedics 38 2, Biomedics 55 2, Biomedics 55 Premier 2, Biomedics EP, Biomedics XC 2, Extreme H20 54% 2, Extreme H2O 59% Thin 2, Extreme H2O 59% Xtra 2, FreshLook Handling Tint 2, O2 Optix 2, Precision UV 2, SofLens 38 2, SofLens 59 2, Vertex Sphere
    1. Monthly Disposable Contact Lenses

      Air Optix Aqua 2, Air Optix Night & Day Aqua, Biofinity 2, Clarity H2O, Focus Monthly Visitint 2, Focus Night & Day 2, Frequency 55 2, Frequency 55 Aspheric 2, Optima 38 SP 2, Preference 2, Preference Standard 2, Proclear Compatibles 2, PureVision 2
    1. Color Contact Lenses 2 3 4 5 6 7

      Acuvue 2 Colours - Enhancers 2, Acuvue 2 Colours - Opaques 2, Expressions Colors 2, Focus 1-2 Week SoftColors 2, FreshLook Dimensions 2, Focus Monthly SoftColors 2, FreshLook ColorBlends 2, FreshLook Colors 2, FreshLook One-Day 2
    1. Gas Permeable Contact Lenses 2 3

      Boston 7 2, Boston Envision 2, Boston EO 2, Boston Equalens 2, Boston Equalens II 2, Boston ES 2, Boston II 2, Boston IV 2, Boston RXD 2, Boston XO 2, Boston XO2 2, Flosi 2, Fluorex 300 2, Fluorex 500 2, Fluorex 700 2, Fluorocon 2, Fluoroperm 151 2, Fluoroperm 30 2, Fluoroperm 60 2, Fluoroperm 92 2, Hydro 02 2, OP-2 2, OP-10 2, OP-3 2, OP-6 2, O-Perm 30 2, O-Perm 60 2, Optacryl 60 2, Optimum Classic 2, Optimum Comfort 2, Optimum Extra 2, Optimum Extreme 2, Paragon HDS 2, Paragon HDS 100 2, Paragon Thin 2, Paraperm 02 2, Paraperm EW 2, PMMA 2, Polycon II 2, SA 18 (Phoenix 18) 2, SA 32 (Phoenix 32) 2, SGP I 2, SGP II 2, SGP III 2, Trans-aire 2
    1. Toric Contact Lenses 2 3

      Acuvue Advance for Astigmatism 2, 1-Day Acuvue Moist for Astigmatism, Avaira Toric, Extreme H20 54% Toric, Purevision 2HD, Purevision 2HD for Astigmatism, Acuvue Oasys for Astigmatism 2, Air Optix for Astigmatism 2, Biomedics Toric, Biofinity Toric, ClearSight 1 Day Toric, Focus Dailies Toric 2, Focus Monthly Toric 2, Frequency 55 Toric 2, Frequency 55 Toric XR, FreshLook ColorBlends Toric 2, FreshLook Toric 2, Optima Toric 2, Preference Toric DW 2, Preference Toric XR, Proclear Toric 2, Proclear Toric XR, PureVision Toric 2, SofLens 66 Toric 2, Vertex Toric 2, Vertex Toric XR,
    1. Bifocal Contact Lenses 2

      Acuvue Bifocal 2, Biofinity Multifocal, Acuvue Oasys for Presbyopia, Air Optix Aqua Multifocal, Focus Dailies Progressives 2, Frequency 55 Multifocal, Proclear Multifocal, PureVision Multi-Focal 2, SofLens Multi-Focal 2
    1. Vial Contact Lenses

      Silsoft Aphakic Adult, Silsoft Super Plus Kids, Softcon EW 2,
    1. Other Contact Lenses 2 3, & Contact Lens Care 2 3 4 5 6 7 8 9 10 11

      Celebrity Contact Lenses 2, Halloween Contact Lenses 2, Novelty Contact Lenses 2, Special Effects Contact Lenses 2, Sports Contact Lenses 2
  • Contact Lens Solutions

    1. Multi-Purpose Solutions

      Aquify, Biofresh, Biotrue, Clear Care, COMPLETE, OPTI-FREE EXPRESS, OPTI-FREE Pure Moist, OPTI-FREE RepleniSH, Oxysept, ReNu Fresh, ReNu Sensitive, RevitaLens, Sensitive Eyes Daily Cleaner, Sensitive Eyes Plus Saline, Ultrazyme
    1. Gas Permeable

      Boston Advance (GP), Boston Conditioning and Cleaner (GP), Boston One Step Liquid Enzymatic (GP), Boston Simplus (GP), OPTI-FREE GP
    1. Protein Removers

      OPTI-FREE Supra Clens, ReNu 1 Step liquid Protein Remover
    1. Comfort Drops

      Blink Contacts Lubricating Eye Drops, Boston Rewetting Drops (GP) COMPLETE Blink-N-Clean Lens Drops, OPTI-FREE Pure Moist Rewetting Drops OPTI-FREE RepleniSH Rewetting Drops, ReNu MultiPlus Rewetting Drops ReNu Rewetting Drops, Sensitive Eyes Rewetting Drops
  • Eyewear

    1. Eyeglasses & Reading Glasses

      Prada Eyeglasses, Armani Eyeglasses, Versace Eyeglasses, Calvin Klein Eyeglasses, Ray Ban Eyeglasses, Oakley Eyeglasses, Vogue Eyeglasses, DKNY Eyeglasses, Cazal Eyeglasses, Safilo Eyeglasses
    1. Sunglasses

      Oakley Sunglasses, Ray Ban Sunglasses, Christian Dior Sunglasses, Prada Sunglasses, Spy Sunglasses, Dolce & Gabbana Sunglasses, Maui Jim Sunglasses, Smith Sunglasses, Versace Sunglasses, Bolle Sunglasses
  • Eye Care Forums

    1. Eye Health

      Eye Surgery 2 3 4 5, General Eye Health 2 3 4 5 6 7 8 9,
    1. Eye Care Professionals

      ECP Corner
  • News

    1. News Archive

      2010 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec) 2009 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec) 2008 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec) 2007 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec) 2006 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec) 2005 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec) 2004 (Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec)