Polyopia/diplopia is seen in which type of cataract?
**Core Concept**
A cataract is a clouding of the lens in the eye, leading to vision impairment. Polyopia (multiple images) and diplopia (double vision) are symptoms that can be caused by certain types of cataracts due to irregularities in the lens' curvature or refractive power.
**Why the Correct Answer is Right**
The correct type of cataract associated with polyopia/diplopia is a posterior subcapsular cataract (PSC). This type of cataract typically affects the posterior (rear) part of the lens capsule and can cause irregularities in the lens' curvature, leading to multiple or double images. The pathophysiology involves the disruption of the normal lens shape and refractive power, causing light to be focused in multiple or incorrect locations on the retina.
**Why Each Wrong Option is Incorrect**
**Option A:** Nuclear cataract - This type of cataract primarily affects the nucleus of the lens and is more commonly associated with decreased vision and glare sensitivity, rather than polyopia/diplopia.
**Option B:** Cortical cataract - Cortical cataracts affect the cortex of the lens and are often associated with glare and halos, but not typically with polyopia/diplopia.
**Option C:** Intumescent cataract - Intumescent cataracts are characterized by a swollen lens and are often associated with increased intraocular pressure and vision loss, but not typically with polyopia/diplopia.
**Clinical Pearl / High-Yield Fact**
The key to differentiating between types of cataracts is understanding the location and extent of lens involvement, as this can significantly impact symptoms and treatment options.
**Correct Answer: C. Posterior subcapsular cataract.**