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Conversion Chart: Refractive State to “estimated” Visual Acuity [1][2]
[1] Spherical results are based upon minus (-) cylinder convention. [2] Source: “Composite Chart of Refractive State to V.A.” Derived from Peter’s multiple tables. Peters, H.B. (1961): The Relationship between Refractive Error and Visual Acuity at Three Age Levels. A.A.A.O., 38:4.
Not Recommended for conversion of screening results for children screened for amblyopic risk factors
Myopia Hyperopia Nearsighted Farsighted Minus (-) Sphere Plus (+) Sphere Plus (+) Sphere Plus (+) Sphere Ages: All Estimated Visual Acuity Ages: 5y to 15y Ages: 25y to 35y Ages: 45y to 55y Estimated Visual Acuity -0.5 20/30-40 +2.00 +1.25 +1.00 20/ -0.75 20/50 +3.00 +1.75 +1.25 20/ -1 20/60 +3.25 +2.50 +1.50 20/ -1.25 20/70 +3.75 +3.00 +1.75 20/ -1.5 20/100 +4.25 +3.50 +2.00 20/ -2.5 20/200 +4.75 +4.00 +2.50 20/
Instructions for:
Conversion Chart Refractive State to “estimated” Visual Acuity
Example 1 DS Result in minus (-), use “myopia” columns Myopia conversions are for all ages Conversion for this example indicates an “estimated” visual acuity of 20/60 (OD) and 20/60 (OS) Example 2 DS Result in plus (+), use “hyperopia” columns Hyperopia conversions require age selection Conversion for this example indicates an “estimated” visual acuity of 20/40 (OD) and 20/40 (OS) for a 25 to 35 years of age subject Example 3 Conversion for this example indicates an “estimated” visual acuity of 20/20(OD) and 20/20 (OS) for a 5 to 15 years of age subject This example indicates a 2.50 diopter variance in refractive power, identified as “anisometropia.” “Complete Eye Exam Recommended” is properly identified for the subject even when the conversion indicates 20/
Visual Acuity conversions not intended as an alternative to the recommendation presented on Spot.
