All are the causes of complicated cataract except:
**Complicated Cataract Causes**
**Core Concept**
Complicated cataract, also known as secondary cataract, is a type of cataract that develops as a result of intraocular surgery, trauma, or other ocular conditions. It is characterized by the accumulation of lens epithelial cells and their derivatives, leading to opacification of the lens.
**Why the Correct Answer is Right**
The correct answer is a combination of factors that contribute to the development of complicated cataract. These include:
* **Trauma**: Physical injury to the eye can cause lens damage and lead to the formation of complicated cataract.
* **Intraocular surgery**: Previous eye surgery, such as cataract removal or vitrectomy, can cause lens epithelial cell proliferation and opacification.
* **Infection**: Bacterial, fungal, or parasitic infections can cause lens inflammation and lead to complicated cataract.
* **Iridocyclitis**: Inflammation of the iris and ciliary body can cause lens epithelial cell damage and opacification.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify a known cause of complicated cataract. Without more information, it is difficult to determine why this option is incorrect.
* **Option B:** This option is incorrect because it is not a recognized cause of complicated cataract. However, it is worth noting that certain metabolic disorders, such as diabetes, can increase the risk of developing cataracts, including complicated cataract.
* **Option C:** This option is incorrect because it is not a known cause of complicated cataract. However, certain medications, such as steroids, can increase the risk of developing cataracts, including complicated cataract.
**Clinical Pearl / High-Yield Fact**
To differentiate between complicated cataract and age-related cataract, look for a history of trauma, intraocular surgery, or infection. Also, note the presence of posterior subcapsular cataract, which is more common in complicated cataract.
**Correct Answer: D.**