Lens, Glaucoma, And The Fundus Practice Test

An incipient cataract is defined as affecting what percentage of lens volume?

Less than 15% 15–30% More than 50% 100%

Correct Answer:

Less than 15%

Explanation:

Grading cataracts by how much of the lens is involved helps distinguish early from more advanced stages. An incipient cataract is the earliest detectable stage, with only a small portion of the lens becoming opaque. Conventionally, this corresponds to less than about 15% of the lens volume. At this level the opacity is minimal and vision is often only mildly affected, if at all, and the opacities may be confined to a small area. As the opacity expands beyond roughly 15%, the condition progresses to early immature stages, and larger involvement (such as 50% or more) marks more advanced disease like mature cataract, which markedly impairs vision. So the defining mark for incipient is a very small fraction of lens volume, specifically under 15%.

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