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The diagnosis of esotropia is correct in this context because it specifically refers to a condition where one or both eyes turn inward. This misalignment can be noticeable in a person when they are trying to focus on an object, leading to double vision and difficulty with depth perception. Esotropia is often diagnosed early in childhood, but it can also occur in adults due to various factors such as eye muscle imbalance or neurological conditions.

Chalazion, on the other hand, is a type of cyst that forms in the eyelid due to a blocked oil gland and does not involve the alignment of the eyes. Glaucoma is a group of eye conditions that damage the optic nerve, often associated with increased intraocular pressure, which does not relate directly to the eye's position. Aphakia refers to the absence of the lens in the eye, commonly due to cataract surgery, but it does not describe a misalignment issue. Thus, esotropia is the most relevant diagnosis related specifically to inward eye turn.