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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