Corrective Lenses and Binocular Vision
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The emmetrope who looks at infinity has no need to accommodate (A = 0) and the convergence of his principal lines of sight is zero (C = 0). The same conditions must remain valid for the corrected ametrope (except sometimes in the case of heterophoria). Let us consider, for example, a myope who is looking at infinity, with or without his glasses. For the eyes to maintain the same relative position in both cases, it is necessary for the point M, which is being looked at, and its image M′, through the lens to be aligned with the center of the entrance pupil, i.e., the principal line of sight should pass through the lens without deviation, hence the classic condition: the separation of the optical centers of the lenses must equal the interpupillary distance measured in far vision.
KeywordsRetinal Image Binocular Vision Prism Diopter Entrance Pupil Principal Line
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