Measurement of Eyelid Margin to Reflect Distance (Mrd)

Measurement of eyelid margin to reflect distance (MRD). The distance is measured from the middle of the pupil (i.e. the corneal light reflex when the light is in front of the patient) to the upper eyelid margin (MRD1) and the lower eyelid margin (MRD2).

Picture: Duodecim Medical Publications Ltd, text: Tiina Leivo