**Question:** The most common complication of hypermature sclerotic cataract is

A. Nuclear sclerosis
B. Posterior capsule rupture
C. Lens subluxation
D. Intraocular lens dislocation

**Core Concept:** Hypermature cataract is a type of mature or old cataract that has progressed further than a mature cataract, showing signs of degeneration and hardening of the lens. This condition increases the risk of complications due to the altered lens properties and structure.

**Why the Correct Answer is Right:** The correct answer, **D. Intraocular lens dislocation**, is related to the hypermature sclerotic cataract because the advanced stage of the cataract weakens the lens capsule, making it prone to rupture and dislocation of the intraocular lens (IOL).

**Why Each Wrong Option is Incorrect:**

A. **Nuclear sclerosis (A.):** While nuclear sclerosis is a common feature of hypermature cataracts, it is not the most common complication. Nuclear sclerosis refers to the hardening and yellowing of the lens nucleus, which is a part of the cataract progression. It does not directly cause complications like intraocular lens dislocation.

B. **Posterior capsule rupture (B.):** Posterior capsule rupture is a complication related to phacoemulsification cataract surgery, not hypermature sclerotic cataracts. This complication occurs during the surgical procedure when the capsule is manipulated, and not a direct consequence of the cataract stage.

C. **Lens subluxation (C.):** Lens subluxation is a complication related to mature or elderly cataracts. It occurs when the lens becomes partially dislocated from its normal position, again, not specific to hypermature sclerotic cataracts.

**Clinical Pearl:** The most important aspect to remember when dealing with advanced cataracts is to be aware of the increased risk of intraocular lens dislocation due to weakened lens capsule in hypermature sclerotic cataracts. This understanding helps in proper management and decision-making regarding cataract surgery timing and approach.