Developed by Neal H. Atebara, MD. Redrawn by C. H. Wooley.
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Refractive Mgmt/Intervention
Viewing system of a direct ophthalmoscope. A, A bundle of light rays emerges from the emmetropic eye with zero vergence. B, A bundle of light rays emerges converging from the myopic eye with positive vergence; the corrective lens is minus. C, A bundle of rays with negative vergence diverges coming out of the hyperopic eye; the corrective lens is plus.