After completion of monocular subject refraction, binocular balancing is performed to balance the state of accommodation between two eyes. Binocular balancing aims to balance the state of accommodation of the two eyes. The procedure ensures that a person exerts the same amount of accommodation through distance correction while viewing a near target.
During monocular refraction, each eye is tested separately, as eye position and accommodative status can change in binocular viewing conditions, so it is important to balance the state of accommodation between two eyes.
This test should not be performed if the patient is monocular, strabismus, or pseudophakic or if the visual acuity difference is large between two eyes. This test is not necessary if the patient is presbyopic or if binocular subjective refraction was performed earlier.
Binocular balancing is also known as the equalization test, spherical equalization and binocular balancing of accommodation.
Methods of binocular balancing
- Vertical prism dissociation method.
- Alternate occlusion method
- Bichrome prism dissociated method.
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Lecturer (Nethradhama School of Optometry)
Moptom