Causes of uniocular diplopia

Uniocular diplopia refers to the appearance of an object in double even when viewing it through one eye. The causes of uniocular diplopia are:

Subluxated clear lens
Subluxated intraocular lens
Keratoconus (irregular refraction from corneal surface)
Double pupil (congenital / large iridectomy / iridodialysis)
Incipient cataract (this usually causes polyopia – due to irregular refraction due to multiple water clefts within the lens)

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