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Anisokonia
1.
2.
3. Anisokonia :
ο Anomalies of binocular vision .
ο Ocular images are unequal in size or shape or both .
ο Its important lies in case of eye strain which is difficult
to assess .
ο Etiology:
ο Optical anisokonia
ο Retinal anisokonia
ο Cortical anisokonia
4. ο Optical anisokonia :
inherited .
Acquired .
Anisometropia of high degree .
ο Retinal Anisokonia :
Displacement of retinal
image towards nodal point
in one eye .
ο Cortical Anisokonia :
A symmetrical simultaneous
perception in spite of equal size
of two images .
5. Clinical types:
ο Spherical :
ο Image may be magnified or minified equally in both
merida .
ο Cylindrical:
ο Image is magnified of minified symmetrical in one
meridia .
ο A symmetrical :
ο Prismatic .
ο Image difference increases progressively in one
direction
6. ο Pincushion:
ο Image distortion increases progressively in both direction
as seen with high plus correction in aphakia .
ο Barrel .
ο Image distortion decreases progressively in both direction
as seen in high minus lenses .
ο Oblique :
ο Image size remain the same but there occurs oblique
distortion of shape .
7. Symptoms :
ο Asthenopic symptoms :
ο Occurs when the difference in image size of the two
images between 0.75 to 5%
ο Headache , difficulty in reading , photophobia ,
difficulty in fixation , vertigo etc .
ο Disturbance of binocular vision .
ο Diplopia occur only if the difference exceeds 5%.
ο Disturbance in the depth perception and spatial dis β
orientation.
ο Suppression of one eye
8. Treatment
ο Optical < IOL in Aphakia.
contact lenses.
Refractive surgery.
ο Retinal Anisokonia :
corrected by treating the causative disease.
ο Cortical Anisokonia :
Difficult to treat .