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Medical Forum / General / Vision / April 2005Tired eyes after extended use of Focus Night and Day Contact Lenses
I tried using the Focus N & Ds for 2 days continuous wear and my eyes got extremely tired after that. My eyes did not get noticeably redder but just got extremely tired and uncomfortable. I had to remove the lenses. My eyes have since recovered after a night's rest. What could be the cause of the fatigue as I don't experience this when wearing glasses? > I tried using the Focus N & Ds for 2 days continuous wear and my eyes got > extremely tired after that. My eyes did not get noticeably redder but just > got extremely tired and uncomfortable. I had to remove the lenses. My eyes > have since recovered after a night's rest. What could be the cause of the > fatigue as I don't experience this when wearing glasses? Just a layman's (I work evenings and weekends!) guess: perhaps the prescription isn't correct yet?  SignatureCheers, Bev =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+= "The object in life is not to be on the side of the majority, but to be insane in such a useful way that they can't commit you." -- Mark Edwards > Just a layman's (I work evenings and weekends!) guess: perhaps the > prescription isn't correct yet? Duh.. yeah, Bev has a real point. I mentioned modulus and standoff. These influence the optics. -425 in one material might act as -475 with another. Not often 050 of difference, but it happens. -MT >> Just a layman's (I work evenings and weekends!) guess: perhaps the >> prescription isn't correct yet? [quoted text clipped - 3 lines] > I mentioned modulus and standoff. These influence the optics. -425 in one > material might act as -475 with another. But wouldn't the lens manufacturer have graded them according to their true refraction? "Andrew Chew" <andrew@nospam.alumni.nus.edu.sg> > But wouldn't the lens manufacturer have graded them according to their > true refraction? Of course, but consider the variability of the individual corneas those lenses are put on. Oblate, prolate, hills and valleys, enough variation so that no "grading" can be precisely right in all cases. The best answer is to overrefract each individual, and even precise correction doesn't guarantee equal acuity with different materials. -MT My two cents: I've found that when fitting N&D and lenses of that modulus, it is critical to over-refract to determine final lens power at any power level, and especially for powers over +/- 4D. Further, when a patient is changing from a low DK material or improperly fit (or worn!) lens, as the cornea heals/de-swells over the first week or so, the refraction changes and the power needs to be adjusted. And, as MT said, the resulting acuity difference between lenses and even between eyes is not necessarily going to be the same. Sometimes when I fit patients, I trial a number of different lenses in each eye. I hope that the most comfortable one provides the best vision, but that is not always the case. --------- BTW, just stopped by for my monthly check to see what's going on over here at sci.med.vision. I "see" that the same BS is "happening", with 75-80% of the traffic having to do with the "dynamic trio" of Otis, Rishi and AndrewJ. I've kill filed all of them and threads with related subjects and it's remarkable that a few "appropriate" posts get through, but even half of them are still "related" to those "pointless points." (I do so enjoy the pointless quotes!) So I'll go away again and check back next month. Best wishes to all of you who are still here and dealing with real issues from real people. --LB, O.D. > My two cents: I've found that when fitting N&D and lenses of that > modulus, it is critical to over-refract to determine final lens power at [quoted text clipped - 12 lines] > > BTW, just stopped by for my monthly check to see what's going on over > here at sci.med.vision. I "see" that the same BS is "happening", with > 75-80% of the traffic having to do with the "dynamic trio" of Otis, [quoted text clipped - 6 lines] > > --LB, O.D. Thanks for stopping by, Larry. Actually, most of deal with "real" issues from "real" people everday. For some of use, sci.med.vision is akin to relaxation, and at times, entertainment. Pick and choose. DrG >> I tried using the Focus N & Ds for 2 days continuous wear and my eyes got >> extremely tired after that. My eyes did not get noticeably redder but [quoted text clipped - 6 lines] > Just a layman's (I work evenings and weekends!) guess: perhaps the > prescription isn't correct yet? I am very sure the prescription is right on when I'm wearing glasses. The optometrist checked it with the red/green backgrounds. I have heard if one's prescription exceeds -4, a formula is applied to adjust for the curvature of the lens or something, so people end up using contacts of a lower prescription. However my prescription is -2.25 and -3.00 so that doesn't apply. >I tried using the Focus N & Ds for 2 days continuous wear and my eyes got >extremely tired after that. My eyes did not get noticeably redder but just >got extremely tired and uncomfortable. I had to remove the lenses. My eyes >have since recovered after a night's rest. What could be the cause of the >fatigue as I don't experience this when wearing glasses? There are a half-dozen possible reasons and it's pretty tough to know which of them apply to you without seeing the lenses on your eye. -Movement on blink, too loose or too snug, pooling, tear circulation -Affinity and interreaction between the lens material and each individual's proteins/lipids/mucins -Edge design and contour interaction, modulus, standoff -Surface tension and wettability of the lens Ciba's designs are usually very comfortable but some people never get comfortable with FND. Acuvue's 8.3 silicon hydrogel is establishing a better track record for comfort. It isn't approved for overnight yet. PureVision will be available again in 2-3 weeks, I hope. As a rule, the material doesn't matter as much as the fit. It's possible some silicone hydrogels might be inherently less comfortable. It isn't likely Ciba designed an uncomfortable lens. -MT >>I tried using the Focus N & Ds for 2 days continuous wear and my eyes got >>extremely tired after that. My eyes did not get noticeably redder but just [quoted text clipped - 24 lines] > > -MT The optometrist who attended to me checked the fit when I put on the lenses and she said it was very good. I guess it could be one of the other reasons you listed then. It's difficult for me to understand why you have to succumb to such a nightmare? What the ods are saying? You suffer from a disease, and the medicine is worst than the malady!!! What kind of world have we created? AND YOU STILL CONTINUE TO TRUST THESE PEOPLE??? Please wake up! have you noticed that most people just ignor what you say? > I tried using the Focus N & Ds for 2 days continuous wear and my eyes got > extremely tired after that. My eyes did not get noticeably redder but just > got extremely tired and uncomfortable. I had to remove the lenses. My eyes > have since recovered after a night's rest. What could be the cause of the > fatigue as I don't experience this when wearing glasses? Had you been wearing another brand of lenses prior? DrG >> I tried using the Focus N & Ds for 2 days continuous wear and my eyes > got [quoted text clipped - 9 lines] > > DrG I have tried 1-day Acuvues but actually find the FNDs more comfortable due to the higher oxygen permeability. |
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