Prescribing Magnification: Strategies for improving Accuracy and Consistency
All low vision practitioners develop their own individual approaches to prescribing magnifying devices. The simplest is the “cafeteria” approach in which the patient is presented with an array of low vision magnifiers and asked to make a selection. In time, the cafeteria will develop a corner delicatessan atmosphere with the proprietor proudly giving advice based on the experience and comments of previous customers. “Try this one, it seems stronger.” “Try moving closer, that often helps.” “See if it looks better through the bifocal part of your glasses.” In contrast, trained professionals prefer to use systems based on measurements of resolution ability, magnification effects, tests of performance and judgements of comfort and convenience.
KeywordsVisual Acuity Enlargement Ratio Magnification Effect Reading Chart Size Progression
Unable to display preview. Download preview PDF.
- 6.C.H. Keeler: Visual aids for the pathological eye (excluding contact lenses). Trans. Ophthalmol. Soc. U.K. 76, 605 (1956)Google Scholar
- 7.H.T. Lewis: UNC near vision chart. J. Vision Rehab. 3(1), 8 (1985)Google Scholar
- 8.L.L. Sloan, D. Brown: Reading cards for selection of optical aids for the partially sighted. Am. J. Ophthalmol. 55, 1187 (1963)Google Scholar
- 9.I.L. Bailey: Centering high addition spectacle lenses. Optom. Mthly. 70, 523 (1979)Google Scholar
- 10.I.L. Bailey: Combining hand magnifiers with spectacle additions. Optom. Mthly. 71, 458 (1980)Google Scholar
- 11.I.L. Bailey: The use of fixed-focus stand magnifiers. Optom. Mthly. 72(8), 37 (1981)Google Scholar
- 12.I.L. Bailey: Principles of near vision telescopes. Optom. Mthly. 72(9), 32 (1981)Google Scholar