Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 36
e retinais too great and the ciliary muscle soon relaxes, causingthe object looked at to run together, leading to headache,asthenopia, and sometimes strabismus. Hypermetropesgenerally complain of headache, especially over the eyes,and quite often attribute the pain over and in the eyes to nervous… … Figure 17. A proper convex lens placed in front of this eye will shorten the rays fromF to F so that they will focus exactly on the retina. The visual angle in hypermetropic eyes may be so longthat glasses are required for distance to obtain clear anddistinct vision as well as for near work. In…
Eye · Lenses
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