Examination of the Lens

The ophthalmologist uses a slit lamp to examine the lens. The eye can also be examined with a focused light if necessary.

Direct illumination will produce a red reflection of the fundus if the lens is clear and gray shadows if lens opacities are present. The examiner then illuminates the eye laterally with a focused light held as close to the eye as possible and inspects the eye through a +14 diopter loupe (see Fig. 1.10). This examination permits better evaluation of changes in the conjunctiva, cornea, and anterior chamber. With severe opacification of the lens, a gray coloration will be visible in the pupillary plane. Any such light-scattering opacity is referred to as a cataract.

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