Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 44
iMgure 25.15oih iiiei idiaiis are hypermetropic. The horizontal is more so than the \ertical. varieties. The person is hypermetropic in one directionand myopic in the other. The rays coming through oneprincipal meridian are brought to a focus before they reachthe retina, and the rays coming in at… … Figure 26.Both meridians are myopic. The vertical more so than the horizontal. are brought to a focus beyond the retina. See figure 27. 6. Irregular astigmatism is the condition in which there are several refractive errors in the same meridian. It may be either congenital or acquired. It is almost…
Eye · Lenses
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