Typical appearance of diabetic cataract is
**Core Concept**
Diabetic cataract is a type of cataract that develops in patients with diabetes mellitus due to the accumulation of sorbitol in the lens fibers, leading to osmotic changes and eventual lens opacity.
**Why the Correct Answer is Right**
The accumulation of sorbitol in the lens fibers is due to the enzyme aldose reductase, which converts glucose into sorbitol in the presence of NADPH. This process is a result of the polyol pathway, a metabolic pathway that helps to maintain redox balance in the cell. The accumulation of sorbitol leads to an increase in the osmotic gradient across the lens fibers, causing water to enter the fibers and resulting in lens swelling and eventual opacity.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the typical appearance of diabetic cataract.
**Option B:** This option is incorrect because it describes a different type of cataract, such as a snowflake cataract.
**Option C:** This option is incorrect because it is a description that is not specific to diabetic cataract.
**Clinical Pearl / High-Yield Fact**
Diabetic cataract can be prevented or delayed with the use of aldose reductase inhibitors, which are a class of medications that can reduce the accumulation of sorbitol in the lens fibers.
**Correct Answer:** C. Snowflake cataract is the typical appearance of diabetic cataract, characterized by a feathery or snowflake-like pattern of lens opacity.