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Slit lamp
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=== Transillumination or retroillumination === [[File:Retro-illumination.jpg|thumb|100px|Retro-illumination of anterior subcapsular cataract]] In certain cases, illumination by optical section does not yield sufficient information or is impossible. This is the case, for example, when larger, extensive zones or spaces of the ocular media are opaque. Then the scattered light that is not very bright normally is absorbed. A similar situation arises when areas behind the crystalline lens are to be observed. In this case the observation beam must pass a number of interfaces that may reflect and attenuate the light.<ref name="Zeiss p. 17"/>
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