Which of the following is a valid category of cataracts by location?

• A. Capsular
• B. Morgagnian cataract
• C. Senile cataract
• D. Posterior lenticonus

Answer: (A)

Cataracts can be classified by where the opacity sits in the lens. A cataract that involves the lens capsule is a valid location-based category because it specifies the structural part affected, distinguishing it from opacities in other parts of the lens such as the nucleus or cortex. Morgagnian cataract describes a hypermature stage with degenerative changes, not a location. Senile cataract is an age-related umbrella term, not a specific location within the lens. Posterior lenticonus is a congenital deformity of the posterior lens surface, not a category of cataract by location. So, capsular cataract fits the criteria as a location-based category.