**Core Concept**
Vogt's striae are characteristic corneal changes associated with progressive thinning and conical deformation of the cornea. They are a hallmark of keratoconus, a non-inflammatory, progressive disorder that affects the cornea.

**Why the Correct Answer is Right**
Vogt's striae are fine, vertical, or oblique lines that appear in the corneal stroma due to the stretching and thinning of the corneal tissue. This occurs as a result of the conical deformation of the cornea, leading to a decrease in corneal thickness. The corneal tissue is under increased stress, causing the formation of these characteristic striae. This process can lead to significant visual impairment if left untreated.

**Why Each Wrong Option is Incorrect**
**Option A:** Congenital glaucoma is characterized by increased intraocular pressure in infants and young children, leading to corneal enlargement and opacity. However, Vogt's striae are not a feature of congenital glaucoma.

**Option C:** Aphakia refers to the absence of the lens in the eye, often resulting from cataract surgery. While aphakia can lead to corneal changes, Vogt's striae are not typically associated with this condition.

**Option D:** Subluxated lens refers to a partial dislocation of the lens from its normal position. While this can cause corneal changes, Vogt's striae are not a characteristic feature of subluxated lens.

**Clinical Pearl / High-Yield Fact**
Keratoconus is often associated with thinning of the cornea, particularly in the inferior and nasal quadrants. This thinning can lead to a characteristic "conical" shape of the cornea.

**✓ Correct Answer: B. Keratoconus**