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June 1967

Grid for Scoring Visual Fields: I. Tangent Screen

Author Affiliations

Far Rockaway, NY
From the Glaucoma Department, Manhattan Eye, Ear, and Throat Hospital, New York, and the Eye Services of St. Joseph's Hospital and Peninsula General Hospital, Rockaway, NY.

Arch Ophthalmol. 1967;77(6):780-786. doi:10.1001/archopht.1967.00980020782012

A device is presented for quantitative evaluation of visual fields analagous to what is done for central acuity by the Snellen test. It consists of a grid whose 100 units increase rapidly in area from center to periphery. This produces a relative-value scale, based on function, weighted to assign higher scores to those areas most useful to the patient—higher in center than periphery; higher in lower than in upper field; and higher near horizontal meridian than in the rest of the periphery. Because each of the 100 units equals 1% a direct score, in percentage, of useful field is obtained. The device was given 1,000 tests by a "jury" of 20 ophthalmologists each estimating 50 unknown fields. A satisfactory degree of correspondence was found between their estimates and the grid scores.

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