Diplopia, or double vision, can be either binocular or uniocular. Binocular diplopia occurs when images form on different points of the two retinas and can be caused by paralysis of extraocular muscles, eyeball displacement, or mechanical issues. It presents as uncrossed or crossed diplopia depending on the direction of deviation. Uniocular diplopia causes double vision from a single eye even when the other is closed, due to issues like subluxated lenses or pupils, cataracts, or keratoconus. Treatment focuses on addressing the underlying cause.

1. Diplopia
By Priyanka ( MBBS Student )

2. • A visual defect in which a single object is seen in
duplicate ( double vision )
• Its of 2 types – Binocular & Uniocular

3. Binocular Diplopia
• Formation of image on dissimilar points of the two retinas
• Main causes are
Paralysis or paresis of Extra ocular muscles
Displacement of one eyeball
Mechanical causes- pterygium, symblepheron
Anisometropia
Deviation of ray of light to one eye

4. Its further types are
• Uncrossed Diplopia
• False image seen on same side of deviation. It occurs in
convergent squint.
• Crossed Diplopia
• False image seen on opposite side of deviation. It occurs
in divergent squint.

6. Uniocular diplopia
• Object appears double from the affected eye even when the
normal eye is closed
• Causes –
Subluxated clear lens
Subluxated intraocular lens
Double pupil ( congenital anomaly )
Incipient cataract
keratoconus

7. • Treat the underlying cause
• Temporary relief by occluding the affected eye
• Prism correction if deviation is small, in paralytic squint

8. Thank you !