PSEUDOSTRABISMUS.pptx

Pseudostrabismus is the clinical impression of ocular deviation
when no squint is present.
• Epicanthic folds may simulate an esotropia
• Abnormal interpupillary distance, if short may simulate an esotropia and if wide an exotropia
• Angle kappa is the angle between the visual and anatomical
(pupillary) axes.
○ Normally, the fovea is situated temporal to the
anatomical centre of the posterior pole. The eyes are
therefore slightly abducted to achieve bifoveal fixation
and a light shone onto the cornea will therefore cause a
reflex just nasal to the centre of the cornea in both eyes. This is termed a positive angle kappa.
○ A large positive angle kappa (e.g. temporally displaced
macula) may give a pseudoexotropia
○ A negative angle kappa occurs when the fovea is situated
nasal to the posterior pole (e.g. high myopia). In this
situation, the corneal reflex is situated temporally to the
centre of the cornea and it may simulate an esotropia.

1. PSEUDOSTRABISMUS By Babli Sharma B.Optom , M.Optom

2. Pseudostrabismus is the clinical impression of ocular deviation when no squint is present. Epicanthic folds may simulate an esotropia Abnormal interpupillary distance, if short may simulate an esotropia and if wide an exotropia Prominent epicanthic folds Simulating esotropia Wide interpupillary distance simulating exotropia

3. Angle kappa is the angle between the visual and anatomical (pupillary) axes. Normally, the fovea is situated temporal to the anatomical centre of the posterior pole. E yes are therefore slightly abducted to achieve bifoveal fixation L ight shown onto the cornea will therefore cause a reflex just nasal to the centre of the cornea in both eyes T ermed a positive angle kappa . Normal P ositive, simulating an exotropia

4. A large positive angle kappa (e.g. temporally displaced macula) may give a pseudoexotropia A negative angle kappa occurs when the fovea is situated nasal to the posterior pole (e.g. high myopia). In this situation, the corneal reflex is situated temporally to the centre of the cornea and it may simulate an esotropia . N egative, simulating and esotropia

5. THANK YOU