Transillumination or retroillumination Slit lamp

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retro-illumination of anterior subcapsular cataract


in cases, illumination optical section not yield sufficient information or impossible. case, example, when larger, extensive zones or spaces of ocular media opaque. scattered light not bright absorbed. similar situation arises when areas behind crystalline lens observed. in case observation beam must pass number of interfaces may reflect , attenuate light.








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