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My Uncle has an eye glass prescription which contains for one of the yes as follows: +0.75 in spherical power column +0.5 in cylindrical power column +2.5 in ADD power column. My question is generally sph and cyl columns contain minus values for nearsightedness correction. Here, we see plus value which means farsightedness (reading). If so, why not mention it in ADD power itself which is specifically for farsightedness (reading)? The optometrist said +0.75 and +0.5 powers are for distant seeing. Got confused. Pl clarify. thanks
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Venkat Raghav
General Physician Bangalore

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Hello... Don't get confused, its simple, there are two problems with visual acuity, in lamen language difficulty to see distant objects(nearsightheadness) and difficulty to see near objects... (Farsightedness ). In farsightedness they use convex lense so power is plus, in near sightheadness they use concave lens so negative power. .
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