Rofadun Nisa*
Ptosis is defined as an abnormally low-lying upper eyelid margin with eyes in primary position of gaze. Ptosis is considered congenital if present at birth or if it is diagnosed within the first year of life. Congenital ptosis is generally unilateral (70%) but may be bilateral, and can be isolated or associated with disease of one or more of the extra ocular muscles and/or other systemic conditions. More severe forms may involve hypoplasia of the levator palpebrae superioris muscle or tendon with a minimal or absent eyelid crease. The superior branch of the third Cranial Nerve (CN III) is involved in the contraction of the levator palpebrae superioris muscle which is responsible for the elevation of the eyelids. The uncorrected severe ptosis leads to impairment of vision due to deprivational amblyopia
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