Grades of binocular vision-
Correct Answer: Grade 2: Fusion
Description: Woh described three grades of binocular single vision - Grade I - Simultaneous perception. It is the power to see two dissimilar objects simultaneously. Grade II - Fusion. It consists of the power to superimpose teo incomplete but similar images to form one complete image. Grade III - Stereopsis. It consists of the ability to perceive the third dimension(depth perception). Ref; A.K.Khurana; 6 th Edition; Page no: 342
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Ophthalmology
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