MRD Assessment

MRD-1 (Upper Lid)

MRD-2 (Lower Lid)

Guidelines & Evidence

Verified

Last Review: 2026-07-17

MRD-1: Distance from the upper eyelid margin to the corneal light reflex (Normal: 4-5 mm)

MRD-2: Distance from the corneal light reflex to the lower eyelid margin (Normal: 5 mm)

Palpebral Fissure (PF): MRD-1 + MRD-2

MRD-1 < 4mm typically defines ptosis. Low MRD-1 with a high MRD-2 may suggest eyelid retraction (e.g., in Graves disease).

Last Comprehensive Review: 2026-07-17

British J Clinical PharmacologyJul 21, 2026

Clinical Context

We think this might be relevant to the clinical guidance for MRD-1 / MRD-2 Assessment.

JAMAJul 21, 2026

Clinical Context

We think this has broad domain relevance to MRD-1 / MRD-2 Assessment.

WHO NewsJul 20, 2026

Clinical Context

We think this has broad domain relevance to MRD-1 / MRD-2 Assessment.