Melanopsin‐mediated pupillary light reflex and sleep quality in patients with normal tension glaucoma

May 8, 2019Acta ophthalmologica

Light-triggered pupil response and sleep quality in patients with normal tension glaucoma

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Abstract

The pupillary response to blue light was significantly reduced in patients with normal tension glaucoma (NTG) compared to healthy subjects (p < 0.001).

Impairment of the melanopsin-mediated pupillary pathway is indicated by the reduced pupillary response to blue light in NTG patients.
No significant difference was found in the pupillary response to red light between NTG patients and healthy controls (p = 0.6).
Baseline pupil diameter and the amplitude of pupillary constriction to both red and blue light were reduced in NTG patients (p < 0.05).
Sleep quality, assessed with the Pittsburgh Sleep Quality Index, showed no significant difference between NTG patients and healthy controls (p = 0.6).
There was no correlation between sleep parameters and pupillary light reflex parameters in NTG patients.

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PURPOSE: The intrinsically photosensitive retinal ganglion cells (ipRGCs) and sleep quality are impaired in patients with primary open-angle glaucoma (POAG). In this study, we investigated whether ipRGCs and sleep quality were also impaired in patients with normal tension glaucoma (NTG).

METHODS: We performed pupillometry and sleep quality assessment in 15 patients with NTG and 17 healthy age-matched controls. Pupillometry protocol consisted of monocular stimulation with high illuminance (100 lux) red (633 nm, 300 cd/mor 15.23 log quanta/cm/s) and blue light (463 nm, 332 cd/mor 15.27 log quanta/cm/s) and binocular pupil measurements. Prior to light stimulation, patients were dark-adapted for 5 min. The late postillumination pupillary response (PIPR) to blue light was used as marker of ipRGC activity. Sleep quality was assessed by Pittsburgh Sleep Quality Index (PSQI) questionnaire. 2 2 2 2L ate

RESULTS: The PIPRto blue light was significantly reduced in patients with NTG compared to healthy subjects (p < 0.001), indicating impairment of the melanopsin-mediated pupillary pathway. There was no significant difference in the response elicited by red light (p = 0.6). Baseline pupil diameter and pupillary constriction amplitude to both red and blue light were reduced in patients with NTG (p < 0.05). The global score in PSQI was not significantly different between healthy controls and patients with NTG, indicating normal sleep quality (p = 0.6). Furthermore, we found no correlation between sleep parameters and pupillary light reflex parameters. L ate

CONCLUSION: Patients with NTG exhibited reduced ipRGC activity compared to healthy subjects, while no differences were observed in sleep quality.

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Melanopsin‐mediated pupillary light reflex and sleep quality in patients with normal tension glaucoma

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