Abstract
Purpose :
This study focuses on the effects of different lunch breaks: lying down, sitting with the head on the table and sitting with no lunch break on the choroid of the human eye, and provides the public with a scientific recommendation for lunch breaks from the perspective of eye health.
Methods :
40 subjects were recruited (Changsha Aier Eye Hospital, May 2023 to November 2023), aged 20-35 years, of whom 19 were male and 21 female. The 80 eyes contained 9 eyes with orthoptic or low hyperopia, 30 with low myopia, 27 with moderate myopia, and 14 with high myopia.Swept source optical coherence tomography angiography (SS-OCTA, VG200D; SVision Imaging, Henan, China) was used to used to measure choroidal thickness and choroidal large-vessel volume in the region of the EDTRS ring centered on the macular central sulcus.Each subject rested in the same environment for 3 consecutive days after the baseline examination, taking a lying down, sitting with the head on the table, and sitting without a lunch break. Blood pressure, intraocular pressure, choroidal thickness, and large-vessel volume were required to be measured in the subjects before and after rest.
Results :
Overall in 80 eyes, the choroid was thickened in the lying naptime (11.621±10.394)μm, sitting naptime (2.602±11.462)μm, and sitting without naptime (1.389±9.230)μm, and there was a significant difference between the three (P<0.0001).During the lying lunch break, choroidal thickening was most pronounced in moderate myopia, which was significantly different from the low hyperopic orthokeratology group and the low myopia group, but not from the high myopia eyes (P1 < 0.0001, P2 = 0.0002, P3 = 0.4027).The low hyperopia and myopia groups showed choroidal thinning of about (6.005±14.170) during sitting lunch break, which was significantly different from all other groups（all P< 0.0001）.There was little change in choroidal thickness in all groups in the seated position without lunch break and there was no significant difference between the groups（all P＞0.05）.
Conclusions :
lying down for a lunch break can thicken the choroid, especially if myopia occurs. People with low hyperopia and orthokeratology may experience choroidal thinning while sitting with their head on the table. From an eye health perspective, we recommend choosing to lie flat as a lunch break.
This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.