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To the Editor:
—When discussing with physicians the subject of reading adds, I have repeatedly been struck with the fact that, while the physician had a vague idea that the reading add caused some image magnification, he had no idea as to what images were being compared, or even roughly the extent of the magnification. The following remarks are designed to clarify these points.The prime purpose of a reading add is to help provide a clear, focused retinal image when the accommodation is no longer able to do so. Its magnifying effect is only incidental and is due to the difference in power between an eye that accommodates and an eye that is aided by a convex lens. To make it specific: Say that the static eye has a power of + 58.00 D. To see clearly at 33.3 cm., it has to accommodate 3 D. and thereby increases its
Pascal JI. READING ADD. AMA Arch Ophthalmol. 1954;52(2):328. doi:10.1001/archopht.1954.00920050330012