Fig. 2From: A clinical decision model based on machine learning for ptosisSeven key eye distances manually marked for ptosis patients. a. Margin reflex distance 1 (MRD1): The distance from the upper eyelid margin to the corneal light reflex. b. MRD2: The corneal light reflex to the lower eyelid margin. c. The distance between the inner canthus and the center of the eye. d. The distance between the epicanthus and the center of the eye. e. The distance between the inner and the outer canthus. f. The length of palpebral fissure: The horizontal distance between inner and outer canthus. g. The width of palpebral fissure: The maximum distance between the upper and the lower eyelidsBack to article page