TY - JOUR T1 - The contralateral upper eyelid in ptosis: some observations pertinent to ptosis corrective surgery. JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 120 LP - 124 DO - 10.1136/bjo.63.2.120 VL - 63 IS - 2 AU - H K Mehta Y1 - 1979/02/01 UR - http://bjo.bmj.com/content/63/2/120.abstract N2 - The validity of Hering's law in corrective surgery for ptosis is demonstrated for the first time. It is also shown how Hering's law has been utilised in corrective surgery for unilateral ptosis to elicit a predominant response from the unoperated contralateral upper eyelid. Other implications of reciprocal innervation of the 2 upper eyelids are discussed and a tentative hypothesis is postulated that in a case of true unilateral levator ptosis the fellow upper eyelid will show compensatory retraction. ER -