[Monocular diplopia].

Monocular diplopia is a condition when a single object is seen double with one of the eyes. Fifty-seven cases of this condition are described. Traditional ophthalmologic methods, as well as examinations of the optic system aberrations and determination of diplopia type with a cross pattern were employed in examinations of the patients. A classification of monocular diplopia has been developed, including (1) refraction, (2) aberration, (3) pupillary, (4) retinal, and (5) neurogenic diplopia. Methods of examining this patient population are described and recommendations on the treatment of this condition presented.