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i had an eye test today and asked my optician what causes negative canthal tilt and positive canthal tilt. Ptosis (nct) is caused weak eyelid tendons and muscles and is a sign of aging. However pct is caused constant squinting of the eyes + decent orbital fat which shortens the eyelid length and deep sets the eye, however over squinting leads to tricharsis which is when the eyelids turn inwards.
function affects form = everything
function affects form = everything