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Medical Forum / General / Vision / May 2008interpupillary measurement
How can one tell if the inter-pupillary distance measured for one's eyewear is incorrect? When I turn my head all the way to the right and look towards the left, certain straight-line images appear curved. Is this normal? ( my previous eyewear wasn't like that ) Dear Digital-to-Analog Converter, To measure your Pupillary Distance you need a centimeter ruler. It is relatively simple to make this measurement. The "average" for an adult is about 64 mm, and for a child about 57 mm. Why not check this measurement yourself -- if you think it is wrong. Enjoy, > How can one tell if the inter-pupillary distance measured for one's > eyewear is incorrect? [quoted text clipped - 3 lines] > > Is this normal? ( my previous eyewear wasn't like that ) Your new glasses have more barrel distortion. It increases with degree of myopia, distance off the eye, lens thickness and refractive index. One of those things has changed. Pupil distance isn't usually the culprit. Often you can relieve the weirdness by shaping the frame to fit closer to your eyes, to "wrap" around more at the sides, rather than straight across the nose. If you put up with it for a week or two, most people adapt and forget it. Meanwhile ask if they can adjust your frame to reduce the barrel distortion. Usually they can. -MT > How can one tell if the inter-pupillary distance measured for one's > eyewear is incorrect? [quoted text clipped - 3 lines] > > Is this normal? ( my previous eyewear wasn't like that ) > Your new glasses have more barrel distortion. It increases with degree of > myopia, distance off the eye, lens thickness and refractive index. [quoted text clipped - 6 lines] > > If you put up with it for a week or two, most people adapt and forget it. Is that really normal or natural? I mean, 'just adapt and it will go away'. It's not exactly solving the root problem. The moral of all these problems is obvious: glasses is not the solution! Release from imperfect sight thru rest is! Otherwise you will carry a chronic tension for the rest of your life! Seriously! >> If you put up with it for a week or two, most people adapt and forget it. > > Is that really normal or natural? I mean, 'just adapt and it will go > away'. It's not exactly solving the root problem. OK, we'll repeal the laws of optics just for you. -MT |
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