This document describes two methods for determining the accommodative convergence to accommodation ratio (AC/A ratio): the gradient method and the heterophoria method. The gradient method involves measuring a patient's deviation at 1/3 meter using an accommodative target, then remeasuring with +3.00 and -3.00 lenses over their glasses to calculate the AC/A ratio. The heterophoria method involves measuring the patient's deviation at distance and 1/3 meter, then using a formula to calculate the AC/A ratio from those measurements.

1. By- Raju Rathore
B.opto (5th sem)
DETERMINING ACCOMMODATIVE
CONVERGENCE/ACCOMMODATI
ON RATIO

2. CONTENTS
Gradient Method01
Heterophoria Method02

3. Background of the Topic01
Gradient Method
1. Measure deviation in proper refractive
correction using an accommodative target
at 1/3 meter.
2. Remeasure deviation with +3.00 lenses over
the glasses.
3. Remeasure deviation with -3.00 lenses over
the glasses.
4. Calculate AC/A = (Д_3 00 - Д+3 00) / 6D

4. Background of the Topic02
Heterophoria Method
1. Measure deviation at distance fixation,
with refractive correction in place.
2. Remeasure deviation at 1/3 m (33 cm).
3. Calculate AC/A =1/3 (nA - dA) +
interpupillary distance (cm).

5. THANK YOU
raju.rathore@itmuniversity.org