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Medical Forum / General / Vision / October 2005Some questions regarding RGP contact lenses
I'm getting back into RGP contact lenses after a long hiatus, and reading the group has helped me a lot. I have a couple of lingering questions, though. 1. Does having dry eyes decrease the amount of oxygen that gets to the eye? It seems that even a hyper-Dk lens won't help if there are less tears to deliver the oxygen to the cornea. 2. Does the wetting angle of the lens material only relate to initial comfort or all-day comfort? My understanding is that after the lenses have been in the eye for a little while, a film develops on the lens that reduces the wetting angle on all materials. Does the wetting angle really matter? 3. Does the use of eyedrops create a dependency on eyedrops? I work at a computer all day, and my eyes often get red and scratchy. Eyedrops help, but I wonder if I'm sacrificing long-term comfort for short-term comfort by using the eyedrops. I used to wear Boston ES lenses years ago, and they were OK. Recently I've tried the Menicon Z, the Fluorocon, and soon I'll be trying the Optimum Extra. My hope was that the low wetting angle of the Optimum lenses might help with the dry eye. Does anybody have any opinion on these materials (the Optimum in particular)? TIA -- Bill. > I'm getting back into RGP contact lenses after a long hiatus, and > reading the group has helped me a lot. I have a couple of lingering [quoted text clipped - 3 lines] > eye? It seems that even a hyper-Dk lens won't help if there are less > tears to deliver the oxygen to the cornea. No but dry eyes can make your eyes uncomfortable. If your eyes are dry then the oxygen can still get to your eyes more directly from the air! > 2. Does the wetting angle of the lens material only relate to initial > comfort or all-day comfort? My understanding is that after the lenses > have been in the eye for a little while, a film develops on the lens > that reduces the wetting angle on all materials. Does the wetting > angle really matter? Wetting angle and comfort will vary as lens gets older and more deposited over the weeks and months. Variations in comfort throughout the day are often connected with tear film quality/dry eye issues. > 3. Does the use of eyedrops create a dependency on eyedrops? I work at > a computer all day, and my eyes often get red and scratchy. Eyedrops > help, but I wonder if I'm sacrificing long-term comfort for short-term > comfort by using the eyedrops. It may create a 'psychological' dependency, only in that you realise that the drops are helping you so you want to keep using them! Eyedrops don't adversely affect your eyes themselves - assuming you are talking about ocular lubricants/artificial tears rather than decongestants/vasoconstrictors etc. Keep using 'em. > I used to wear Boston ES lenses years ago, and they were OK. Recently > I've tried the Menicon Z, the Fluorocon, and soon I'll be trying the [quoted text clipped - 3 lines] > > TIA -- Bill. Dom >> 3. Does the use of eyedrops create a dependency on >> eyedrops? I work at a computer all day, and my eyes [quoted text clipped - 8 lines] > lubricants/artificial tears rather than > decongestants/vasoconstrictors etc. Keep using 'em. Errr, I work in front of a computer all day in an air conditioned office in a very dry climate. I've been using drops every 2 to 4 hours. My doc was pretty firm that he wanted me using drops with no preservatives or "soft" preservatives. He and I like Blink. He says that does have a "soft" preservative that he feels is OK. He says that if you are using drops with that frequency you don't want to be dosing your eyes with preservatives that much. (no, I have no idea what the difference is between "soft" preservatives and other preservatives that may not be good for you in quantity). -Quick I'm using Claris rewetting drops, and the bottle says "polixetonium chloride 0.0060% as the preservative." I don't know anything about that. Quick, do your eyes get really red when you work in front of the computer all day? Mine do, and sometimes I wonder if I'm doing damage to my eyes. My doctor doesn't seem too concerned. At any rate, five or six hours using the computer really takes its toll. -- Bill. > I'm using Claris rewetting drops, and the bottle says > "polixetonium chloride 0.0060% as the preservative." I [quoted text clipped - 5 lines] > too concerned. At any rate, five or six hours using the > computer really takes its toll. No. But my eyes rarely get red for any reason. I'm not up on the good and bad chemicals or how much is a lot in eye care stuff. My doc likes Blink. I like Blink because it seems to be just the right viscosity for me, feels good, and (relative to the couple of others I tried) lasts a while. -Quick |
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