A clinical study of the position relationship between the optical fixation and the fovea in healthy adults / 中华眼底病杂志

ABSTRACT

Objective:To observe the positional relationship between the central fixation point of the retina and the fovea in normal adults.Methods:A retrospective clinical study. From August 2019 to January 2020, 100 eyes of 100 normal adults who underwent physical examination at the Fourth People's Hospital of Shenyan g were included in the study. All patients underwent BCVA, diopter, microfield, OCT examination, and axial length (AL) measurement. There were 42 males and 58 females with the average age was 46.4±14.7 years. The average diopter was -1.02±1.99 D, the average AL was 23.22±0.47 mm, the average foveal avascular zone (FAZ) area was 0.38±0.13 mm 2. The MP-3 microperimetry was used for central fixation examination. After the examination, high-definition fundus images were automatically taken and the central fixation point of the retina were automatically calculated by the equipment. The Nidek Overlay functional multi-mode imaging platform was used to superimpose the images containing the central fixation point of the retina and the macular fovea, the positional relationship between the two was observed, and the distance between the two was measured. Pearson correlation analysis was performed on the distance between the fixation point of the center of the retina and the center of the fovea, age, diopter, and FAZ area of the macula. Results:The fixation point of the retinal center of all tested eyes was within the range of the macular fovea, which did not coincide with the center of the macular fovea. Among 100 eyes, the fixation point of the center of the retina were 53, 23, 15, and 9 eyes at the nose, lower, temporal, and upper sides, respectively. The average distance between the fixation point of the center of the retina and the center of the fovea was 158.31±71.56 μm. The distance between the fixation point of the retinal center and the center of the macular fovea and age ( r=0.140), diopter ( r=-0.009), FAZ area( r=0.038) were not correlated ( P=0.165, 0.932, 0.707) in correlation analysis. Conclusion:The central fixation point of normal adult retina is more common on the fovea nasal side.