Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 45
^ may beimproved to some extent, especially if a stenopeic slit set MIXED ASTIGMATISM. … Figure 27.Vertical meridian is myopic and the horizontal is hypermetropic. at the best meridian (in order to cut off all other rays) isused, thus avoiding any metamorphopsia that may arise. 40 PRESBYOPIA OR OLD SIGHT. Presbyopia, old sight, is an accompaniment of thelater 3ears of life. It is a…
Eye · Lenses
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