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Medical Forum / General / Vision / February 2006I went from -2.5 to -3.0 in less than two months =(
I went from -2.5 to -3.0 in less than two months =( I was perscribed -2.5 in both eyes at walmart with acuvue advance. Now, i got -3.0 in both eyes from costco with acuvue oasys. Just great. =( Dear Spockie, Congratualtions! In short order you can expect Neil Brooks to post warnings against you for making that statement, and then he will file a charge against you for giving "medical" advice. Best, Otis your eyes are getting worse due to wearing a minus lens for all the near work you do. -3 contacts are as strong as -3.75 glasses for some people, including me. Ive warned you about this in the past but you dont care. I guess as a(extend) contact wearer, you only "see" your blurry vision once a month for a few minutes, the rest of the time, your contacts are in. > your eyes are getting worse due to wearing a minus lens for all the > near work you do. -3 contacts are as strong as -3.75 glasses for some > people, including me. Ive warned you about this in the past but you > dont care. And I've asked where you find this comparison between human myopes wearing minus and those who don't. -MT http://www.preventmyopia.org All your infomation is there. Minus lens combined with close work is a recipe for rapidly increasing myopia. This explains why many college students become myopic or have their myopia increase. "Can you show me the math for this calculation?" The math means nothing because contacts behaive differently for different people's eyes. The average is 1.25 times so you multiply -3 contacts by 1.25 and you get -3.75 in glasses. My friend wears -3 contacts but her -3 glasses are too weak. Shes going to the optometrist to get -3.75 glasses. Another lady wears -4.25 and -4.75 contacts but shes -5.25 and -6 in glasses. Theres several factors that determine what contact lens power the person needs. You can not directly convert as each person may be different. I was told I needed -4.75 contacts for my -5 glasses pescription. This would overcorrect me by a diopter to a diopter and a half. The -3.25 contacts I have correct me about as well as my -4.25 glasses. You are so full of sh.t. The maths is everything. There is no 1.25 multiplier. Go back to your room and j.rk off. You also know you have no friends, so stop making them up. dr grant > http://www.preventmyopia.org > > All your infomation is there. Minus lens combined with close work is a > recipe for rapidly increasing myopia. This explains why many college > students become myopic or have their myopia increase. Where is the comparison that shows myopes getting more nearsighted because they wear glasses? You never did say. > "Can you show me the math for this calculation?" > > The math means nothing because contacts behaive differently for > different people's eyes. More erroneous information brought to you by Aceman. -MT I guess you and Grant have no explanation why two people could be -5 in glasses but one may need -4 contacts, the other -4.5 contacts. I was -5 in glasses and -4 in contacts. http://www.i-see.org/against_glasses.html http://www.myopia.org/08chapter3.htm Yes, the scripts were wrong in the first place. dr grant I think my optometrist would know what he was doing when he pescribed me. Many of my friend's glasses pescriptions are 1.25 times higher than their contacts. read about vertex distance and get back to me. >I think my optometrist would know what he was doing when he pescribed > me. Many of my friend's glasses pescriptions are 1.25 times higher than > their contacts. read about vertex distance and get back to me. Why? We've told you what the textbooks say about vertex distance and you always know better. -MT Hey dickhead, you have been told by at least 4 optoms here you are wrong. What does it take for you to listen? Now f.ck off and go to bed you little w.nker. Hey dickhead, you have been told by at least 4 optoms here you are wrong. What does it take for you to listen? Now f.ck off and go to bed you little w.nker. >I guess you and Grant have no explanation why two people could be -5 in > glasses but one may need -4 contacts, the other -4.5 contacts. I was -5 > in glasses and -4 in contacts. We certainly do. -MT acemanvx@yahoo.com> wrote >>I guess you and Grant have no explanation why two people could be -5 in >> glasses but one may need -4 contacts, the other -4.5 contacts. I was -5 >> in glasses and -4 in contacts. Ace, I'm a little confused here and I presume you can help me: - What is the actual vertex distance for measurements taken using a phoropter? - What is the actual vertex distance for measurements taken using a trial frame? - Given a high sphere Rx, with astigmatism, does it matter which lens sits in which slot in a trial frame? If so, can you please explain the appropriate technique? - Given an actual vertex distance measurement, can you please walk me through the math used to calculate contact lens power? - Does that math differ if the lens being prescribed is an RGP vs. a toric soft vs. a non-toric (spherical) soft? Thanks. This will be useful information for me.  SignatureLive simply so that others may simply live >acemanvx@yahoo.com> wrote > [quoted text clipped - 23 lines] > >Thanks. This will be useful information for me. Ace?? I could use your help here. Are you gonna' hook a brother up? SignatureLive simply so that others may simply live answers below are from a patient's point of view. - What is the actual vertex distance for measurements taken using a phoropter? As a patient, I was told to look into the phoropter with my chin resting and my head fully touching the metal. Some people sit back an inch or two and the vertex distance results in them getting more minus than they need. Its important the distance from any lens is equal. - What is the actual vertex distance for measurements taken using a trial frame? should be exactly the same as the vertex distance your pescription glasses are. - Given a high sphere Rx, with astigmatism, does it matter which lens sits in which slot in a trial frame? If so, can you please explain the appropriate technique? The highest power lens sits closer to your eye. If not, the vertex distance would throw results off. The cylindar lens sits in front where the optometrist can notice the axis. "- Given an actual vertex distance measurement, can you please walk me through the math used to calculate contact lens power?" Use 1.25 times for vertex distance. My optometrist gave me -4 trial lens. I was a -5 in glasses. However you still have to confirm using an over-refraction. Different eyes will react differently to contacts but many young people need 1.25 times higher glasses vs. contacts. I speak for this result as a patient and the fact my friends have glasses pescriptions 1.25 times higher than their contacts. Some people may stray from the 1.25x formula due to dry eyes, strange accomodation, steep or flat corneas, etc. ALWAYS do an overrefraction! "- Does that math differ if the lens being prescribed is an RGP vs. a toric soft vs. a non-toric (spherical) soft?" I talked to an optometrist on the phone and when I told him I am -5 in glasses, he said he will first try -4.5 RGP contacts. If they are too strong, he will try a lower power(I lose $300 each time) till the desired pescription is arived. For non torics, you dont want to give them to anyone with more than a diopter of astigmastim as this will hurt BCVA and strain the eyes. Spherical equivalent attempts to overcorrect you to compenstate for cylindar. Basically make you +.5 diopters sphere if your cylindar is -1 diopters. Some people dont mind this over the discomfort of torics. You may want to let the patient try both torics and non torics and let him choose which one he prefers. Answers from a patient. Any other questions? > However you still have to confirm using an > over-refraction. See, that's the problem. I do that several times a day and it never comes out to 125%. -MT I guess you should see me and my friends who need 1.25 times higher glasses pescription than contacts. I was -5 in glasses, -4 in contacts. My friend is -3 in contacts, -3.75 in glasses. Another is -2 in glasses, -1.75 in contacts. >I guess you should see me and my friends who need 1.25 times higher > glasses pescription than contacts. I was -5 in glasses, -4 in contacts. > My friend is -3 in contacts, -3.75 in glasses. Another is -2 in > glasses, -1.75 in contacts. I could do that, or you could learn enough optics to confirm what's in the textbooks. Neither is likely to happen. -MT Can you show me the math for this calculation? I calculate -3.00 in CL's is -3.00 in glasses, but heck, my optometry degree isn't worth much, or so the engineers keep telling me. Spockie, you may find that either the first or second test may have the wrong answer. _0.50 does not usually occur in 2 months. dr grant |
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