An immature cataract involves what percentage of lens volume?

An immature cataract involves what percentage of lens volume?

• A. 1-5%
• B. 15-99% (correct)
• C. 100%
• D. <15%

Answer: (B)

The question is about grading cataract maturity by how much of the lens is affected by opacity. An immature cataract means the lens is partially opacified, with a remaining clear portion. In this scheme, opacity occupies between 15% and 99% of the lens volume. That partial involvement distinguishes it from a mature cataract, where the entire lens is opaque (100%), and from incipient or very early changes, which involve only a small fraction of the lens (typically well under 15%). So the best answer is that immature cataract involves 15-99% of the lens volume.

The question is about grading cataract maturity by how much of the lens is affected by opacity. An immature cataract means the lens is partially opacified, with a remaining clear portion. In this scheme, opacity occupies between 15% and 99% of the lens volume. That partial involvement distinguishes it from a mature cataract, where the entire lens is opaque (100%), and from incipient or very early changes, which involve only a small fraction of the lens (typically well under 15%). So the best answer is that immature cataract involves 15-99% of the lens volume.