270
APPENDIX: Estimated Visual Acuity Table
8.6
Estimated Visual Acuity Table
The estimated unaided VA is calculated from the AR (objective) data. The estimated aided VA is cal-
culated by subtracting the LM data from the AR data. For the patient who has cylindrical powers, add
–CYL to the spherical power.
The unaided VA is minimum and the aided VA is 20/30 without the AR data.
Spherical power (D)
Estimated VA value
Decimal
Fraction (feet)
Fraction (meters)
From –7.25
0.03
20/600
6/200
0.032
–6.25 to –7.00
0.04
20/500
6/150
–5.25 to –6.00
0.05
20/400
6/120
–4.25 to 5.00
0.06
20/320
6/100
0.063
–3.25 to –4.00
0.08
20/250
6/75
–2.25 to –3.00
0.1
20/200
6/60
–2.00
0.2
20/100
6/30
–1.75
0.3
20/60
6/20
0.32
–1.50
0.4
20/50
6/15
–1.25
0.5
20/40
6/12
–1.00
0.6
20/30
6/10
0.63
–0.75
0.7
6/7.5
–0.50
0.8
20/25
–0.25
0.9
20/20
6/6
0
1.0
* The table may not correspond to the VA depending on the chart type.
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