The MRD1 is the measurement in millimeters from the light reflex on the patient’s cornea to the upperbeyelid margin, with the patient gazing in the primary position. MRD1 is used to indicate degree of ptosis or retraction.

In this article, we will review common orbital and oculoplastic surgery examination techniques. This is intended for PGY1 and PGY2 ophthalmology residents. When examining the eyelid, it is important to assess both structure and function. MRD1, MRD2, and PFH (Photo: ophthalmologyreview.org) Measuring levator function (photo: parjournal.net)

Aug 11, 2022 · The measurement used to assess ptosis is the marginal reflex distance 1 (MRD 1), which is the distance between the upper lid margin and the corneal light reflex. 4 For reference, the typical cornea is 12 mm, with an upper lid sitting 1-2 mm over the top. For most patients, a normal MRD 1 is 4-5mm.

Apr 6, 2015 · When examining the eyelid for ptosis there are three important measurements that need to be obtained: lid crease height, margin reflex distance (MRD), and levator function. With the patient looking downward, measure the distance from …

Apr 15, 2020 · For MRD1, the distance in millimeters between the central portion of the upper eyelid margin and the pupillary reflex is recorded for both eyes. 9-11 A normal MRD1 is 4mm to 5mm. 5 The difference in MRD1 between the normal and the ptotic eye is the amount of ptosis.

The normal punctum on the lower lid is found positing backward in the medial tear lake which is termed appositional punctal position. Slight changes in punctal position could indicate an early sign of lower eyelid disease.

The distance from upper eyelid margin to corneal light reflex (margin reflex distance, MRD1) can be used to assess for elevated upper eyelid position. MRD1 is normally 4-5mm and may be increased in patients with upper eyelid retraction.

Mar 1, 2010 · The Margin Reflex Distance (MRD1) is the distance from the upper lid margin to the first Purkinje image, or the reflected image from the anterior corneal surface of a light held directly in front of the patient.

Jul 11, 2019 · There are two margin-to-reflex distances (MRD), corresponding to the measurement from the upper and lower eyelids: MRD1: upper eyelid margin-to-light reflex; this is probably the single most important measurement when evaluating ptosis. MRD1 + MRD2 should equal the palpebral fissure height. Levator. function test.

Jun 15, 2020 · Ptosis is present when the upper eyelid is lower than its normal anatomical position, typically 1mm to 2mm below the superior corneoscleral limbus. 1,2 Evaluating the MRD1 can help determine the presence of ptosis, as well as its severity. 3 A normal value for MRD1 is 3.5mm to 5.0mm. 3 Levator function is also important and is a primary ...