The influence of luminous intensity on the eyelid aperture and measurement of the margin reflex distance

The influence of luminous intensity on the eyelid aperture and measurement of the margin reflex distance

To evaluate whether the flashlight feature of smartphones can be used to replace the traditional flashlight for measuring MRD and investigate the relation between increasing light intensities and MRD measurements. A prospective clinical study was conducted with 40 individuals from Hospital de Clínic...

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Bibliographic Details
Published in:Orbit (Amsterdam) Vol. 41; no. 3; pp. 311 - 314
Main Authors: Lima Lang, Martha Pereira, Marinho, Diane Ruschel, Procianoy, Fernando
Format: Journal Article
Language:English
Published: England Taylor & Francis 01-06-2022
Subjects:
Eyelid
flashlight
margin reflex distance
palpebral fissure
smartphone
Eyelid
margin reflex distance
smartphone
palpebral fissure
flashlight
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Summary:To evaluate whether the flashlight feature of smartphones can be used to replace the traditional flashlight for measuring MRD and investigate the relation between increasing light intensities and MRD measurements. A prospective clinical study was conducted with 40 individuals from Hospital de Clínicas de Porto Alegre. Outcome measures: MRD1, MRD2, and palpebral fissure height (PFH) were analyzed by photographic record using different intensity light sources. Flashlight (10 lux): MRD1 mean: 3.97 mm ±1.16; PFH mean: 9.87 mm ±1.53; Smartphone (100 lux) MRD1 mean: 4.02 mm ±1.17; and PFH mean: 9.62 mm ± 1.45 (p > .05). Using a dimmable source of light resulted in a mean reduction of the PFH of 0.75 mm with the highest light intensity (1200 lux). There was no statistically significant association between MRD changes and the iris color, age, and gender of the subjects. There was no statistically significant difference between the MRD measurements using traditional flashlights compared to higher intensity smartphone flashlight. Using a dimmable source of light, there is a statistically significant reduction in palpebral fissure with higher light intensity, which occurs mostly by upper eyelid lowering, probably due to orbicularis oculi muscle contraction. A smartphone with a built-in flashlight can be used to replace the traditional flashlight in clinical practice without prejudice to the evaluation of the MRD.
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ISSN:0167-6830
1744-5108
DOI:10.1080/01676830.2021.1892770