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Boston Equalens Callus?

This is a discussion on Boston Equalens Callus? within the Boston Equalens forums; Someone said that wearing Boston Equalens gets easier because after a while your eyes becomes ...


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  #1 (permalink)  
Old 10-17-2008, 04:21 PM
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Default Boston Equalens Callus?
Someone said that wearing Boston Equalens gets easier because after a while your eyes becomes "callused." She didn't mean that literally, did she? Does the "skin" of your eyes literally get thick and tough like calluses on your fingers?
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Old 12-20-2011, 03:01 AM
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Originally Posted by Nutradude View Post
Someone said that wearing Boston Equalens gets easier because after a while your eyes becomes "callused." She didn't mean that literally, did she? Does the "skin" of your eyes literally get thick and tough like calluses on your fingers?
Im an ecp and have been fitting contact lenses for over 20 yrs, Once upon a time in the 60's and 70's when hard PMMA lenses became popular it was once thought that your lids got callused and just got use to wearing hard lenses.

Its also a reference that people used to describe giant papillary conjunctivitis which is an eye lid disease from the protein deposits on ANY contact lenses.


Eyes do not become callused.
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  #3 (permalink)  
Old 12-20-2011, 10:06 AM
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Originally Posted by luvbostonxo2's View Post
Im an ecp and have been fitting contact lenses for over 20 yrs, Once upon a time in the 60's and 70's when hard pmma lenses became popular it was once thought that your lids got callused and just got use to wearing hard lenses.

Its also a reference that people used to describe giant papillary conjunctivitis which is an eye lid disease from the protein deposits on ANY contact lenses.


Eyes do not become callused.
Okay, but do they become "numb" so you don't feel the lenses as much as you used to, even if they're "hard" PMMA lenses?
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  #4 (permalink)  
Old 12-20-2011, 12:56 PM
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Originally Posted by Nutradude View Post
Someone said that wearing Boston Equalens gets easier because after a while your eyes becomes "callused." She didn't mean that literally, did she? Does the "skin" of your eyes literally get thick and tough like calluses on your fingers?
I don't think so, Nutradude. I don't think your eyes get literally thick and tough, but I think they become less sensitive after a while.
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Old 12-20-2011, 01:13 PM
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Originally Posted by Goliath2001 View Post
Okay, but do they become "numb" so you don't feel the lenses as much as you used to, even if they're "hard" PMMA lenses?
factoid! there aren't any nerve endings in the cornea...the adaptation process is mainly the lids.

The nerve endings in the lids completely quiet down after the adaptation process and providing your rgp's fit well......you will not feel them at all after the adaptation process.
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Old 12-20-2011, 01:24 PM
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Default No Kidding
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Originally Posted by luvbostonxo2's View Post
factoid! there aren't any nerve endings in the cornea...the adaptation process is mainly the lids.
Really? Then how come it hurts so much to just barely touch your cornea?
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Old 12-20-2011, 04:50 PM
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Originally Posted by Trixie View Post
Really? Then how come it hurts so much to just barely touch your cornea?
I think its a programmed response in the brain.
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Old 12-20-2011, 05:02 PM
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Originally Posted by luvbostonxo2's View Post
I think its a programmed response in the brain.
Programmed for what? To react painfully where, as you say, there aren't any nerve endings?

I think I read someplace that there are no blood vessels in the cornea, and that's why air circulation is so important, but I'm quite sure the cornea is packed with nerve endings.
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Old 12-20-2011, 10:52 PM
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Originally Posted by Moneyfornothin View Post
Programmed for what? To react painfully where, as you say, there aren't any nerve endings?

I think I read someplace that there are no blood vessels in the cornea, and that's why air circulation is so important, but I'm quite sure the cornea is packed with nerve endings.
yes sorry I brain farted ....its late here!

yes there are nerve endings but no blood vessels..my bad.
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Old 12-21-2011, 02:43 PM
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Originally Posted by luvbostonxo2's View Post
yes sorry I brain farted ....its late here!

yes there are nerve endings but no blood vessels..my bad.
Yeah the time stamp says that you wrote this reply at almost 10:00 at night. I'm glad you cleared that up.
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Old 12-21-2011, 08:05 PM
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Originally Posted by captainneo View Post
Yeah the time stamp says that you wrote this reply at almost 10:00 at night. I'm glad you cleared that up.
its late for me...didnt sleep well past night.
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Old 12-22-2011, 10:12 AM
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Default Keep it Going
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Originally Posted by luvbostonxo2's View Post
its late for me...didnt sleep well past night.
I hope you slept better last night. You seem to be on a roll with answering questions here today.
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  #13 (permalink)  
Old 01-10-2012, 01:29 PM
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Originally Posted by luvbostonxo2's View Post
Im an ecp and have been fitting contact lenses for over 20 yrs, Once upon a time in the 60's and 70's when hard pmma lenses became popular it was once thought that your lids got callused and just got use to wearing hard lenses.
I just noticed that you said "your lids got callused." Not the eyeball, but the eyelids. Right . . . got it now.
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Old 01-10-2012, 10:35 PM
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Originally Posted by Nutradude View Post
I just noticed that you said "your lids got callused." Not the eyeball, but the eyelids. Right . . . got it now.
It's always been a "weird" anaology and yes when hard pmma lenses were the fashion in the 60's and 70's it was a myth because due to the inability to flex pmma lenses are really irritating bumping into the upper lid but don't forget they were a bit smaller than rgp lenses which are bigger!
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Old 01-11-2012, 11:49 AM
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Originally Posted by luvbostonxo2's View Post
It's always been a "weird" anaology and yes when hard pmma lenses were the fashion in the 60's and 70's it was a myth because due to the inability to flex pmma lenses are really irritating bumping into the upper lid but don't forget they were a bit smaller than rgp lenses which are bigger!
What was a myth in the 60s and 70s?
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Old 01-24-2012, 04:51 PM
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Originally Posted by luvbostonxo2's View Post
don't forget they were a bit smaller than rgp lenses which are bigger!
I always thought that PMMA and RGP lenses were the same. They're not?
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Old 02-03-2012, 02:51 PM
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Originally Posted by Juniorgerbil View Post
What was a myth in the 60s and 70s?
Was it something about callused eyelids?
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Old 02-05-2012, 02:09 AM
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Originally Posted by Moneyfornothin View Post
I always thought that PMMA and RGP lenses were the same. They're not?
totally different lenses but the materials are hard so to speak.
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Old 02-13-2012, 04:51 PM
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Originally Posted by luvbostonxo2's View Post
totally different lenses but the materials are hard so to speak.
So what's the difference between PMMA and RGP lenses?
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Old 02-16-2012, 04:55 PM
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Originally Posted by Nutradude View Post
So what's the difference between PMMA and RGP lenses?
That's a good question. Does anybody have an answer?
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Old 02-16-2012, 10:51 PM
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Originally Posted by Trixie View Post
That's a good question. Does anybody have an answer?
They both resemble each other and look like "hard lenses"! They fit the same but the polymers that they are manufactured from is greatly different! PMMA (polymethamethacrylate) is an acrylate and resembles plexiglass and is impermeable to oxygen. Rgp lens polymers contain PMMA, Flourine, and silicone in varying percentages allowing oxygen to pass between the polymers at the microscopic level. Because of the o2 transmission rgp lenses are larger and are more wettable by nature than PMMA lenses.

Both lens materials gives hyper crisp and sharp visual acuity.
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Old 02-17-2012, 10:53 AM
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Originally Posted by luvbostonxo2's View Post
They both resemble each other and look like "hard lenses"! They fit the same but the polymers that they are manufactured from is greatly different! PMMA (polymethamethacrylate) is an acrylate and resembles plexiglass and is impermeable to oxygen. Rgp lens polymers contain PMMA, Flourine, and silicone in varying percentages allowing oxygen to pass between the polymers at the microscopic level. Because of the o2 transmission rgp lenses are larger and are more wettable by nature than PMMA lenses.

Both lens materials gives hyper crisp and sharp visual acuity.
Wow, I just asked that same question in another thread. Weird.

So to remember the difference between PMMA and RGP is to remember that RGP stand for Rigid Gas Permeable to distinguish them from PMMA lenses, which are not permeable to gasses like oxygen, right?
Attached Images
File Type: jpg Oxygen-Cylinder.jpg (93.8 KB, 3 views)
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  #23 (permalink)  
Old 02-18-2012, 02:11 AM
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Default Right
As far as I know the callous thing is a wives tale. It was even back in the 70's. My Dr. Explained that as the nerves in the eye and lid are exposed to lens wear they will become desensitized to the sensation of the lens being a foreign body. So desensitized is ok and welcome with hard lenses, numb is bad. If you overwear hard pmma lenses your eyes can become numb due to lack of oxygen. Not recommended.
Last edited by hardlens; 02-18-2012 at 02:17 AM.. Reason: Correction
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