This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2018, Subject name: Ophthalmology
Constantly changing refractive error is seen in: 
Select and explain. 
A. Intumescent cataract, B. Diabetic cataract, C. Traumatic cataract, D. Morgagnian cataract
B: Diabetic cataract
Answer: B: Diabetic cataract 
Explanation: In diabetic patients often in hyperglycemia blood sugar level increases leading to myopia and as it becomes hypoglycemia it may lead to hypermetropia This constantly changing refractive error is seen in diabetic with or without cataract. Diabetic Cataract- Snowflake opacities Intumescent cataract This means a swollen cataract due to excessive hydration. The swollen lens pushes the iris forward leading to closure of the angle and producing the so called Phacomorphic glaucoma. Traumatic cataract Traumatic cataract in blunt/concussion trauma is typically in rosette shaped cataract. In penetrating injury, it is usually anterior subcapsular. Morgagnian cataract There is total liquefaction of the coex as a result of which the nucleus sinks inferiorly. The liquefied coex leaks through the intact capsule. And blocks the trabecular meshwork. This leads to photolytic glaucoma or lens protein glaucoma. It also causes phacoanaphylactic uveitis.