ObjectiveTo observe the macular retinal thickness and volume in patients with different degrees of Parkinson's disease (PD).MethodsThirty eyes of 30 patients with primary PD and 20 eyes of 20 healthy subjects (control group) in Xuanwu Hospital of Capital Medical University from October 2016 to October 2017 were enrolled in this study. There were 17 males and 13 females, with the mean age of 63.2±6.4 years and disease course of 3.9±2.4 years. The patients were divided into mild to moderate PD group (15 eyes of 15 patients) and severe PD group (15 eyes of 15 patients). The macular area was automatically divided into 3 concentric circles by software, which were foveal area with a diameter of 1 mm (inner ring), middle ring of 1 to 3 mm, and outer ring of 3 to 6 mm. The middle and outer ring were divided into 4 quadrants by 2 radiations, respectively. The changes of retinal thickness and macular volume of the macular center and its surrounding quadrants were analyzed. SPSS 16.0 software was used for statistical analysis. One-way ANOVA were used to analyze all data.ResultsCompared with the control group, the retinal thickness and volume in macular center and each quadrant of the mild to moderate PD group and severe PD group were reduced. Compared with the mild to moderate PD group, the retinal thickness and volume in macular center and each quadrant of the severe PD group were reduced. The differences of retinal thickness and macular volume among 3 groups were significant (F=5.794, 5.221, 5.586, 5.302, 5.926, 5.319, 5.404, 5.261, 5.603; P=0.001, 0.007, 0.003, 0.005, 0.000, 0.004, 0.004, 0.006, 0.002). In inner ring of the mild to moderate PD group and the severe PD group, the retinal thickness and macular volume in the upper and the nasal were the largest, the inferior was followed, and the temporal was the smallest. In outer ring of the mild to moderate PD group and the severe PD group, the retinal thickness and macular volume in the nasal was the largest, the upper was the second, the temporal and the inferior were the smallest.ConclusionsThe retinal thickness and volume of the macular central fovea and its surrounding areas in PD patients are significantly thinner than that in the healthy subjects. And with the increase of the severity of PD, the macular structure changes obviously, showing macular center and its surrounding macular degeneration thin, macular volume reduced.
ObjectiveTo observe the changes of optic disc structure and retinal nerve fiber layer thickness (RNFL) in patients with different degrees of Parkinson's disease (PD).MethodsThirty eyes of 30 patients with primary PD and 20 eyes of 20 healthy subjects (control group) in Xuanwu Hospital of Capital Medical University from October 2016 to October 2017 were enrolled in this study. The patients were divided into mild to moderate PD group (15 eyes of 15 patients) and severe PD group (15 eyes of 15 patients). All the patients underwent OCT examination. The optic disc area, cup area, C/D area ratio, rim volume, disc volume, cup volume, rim area, C/D area, linear C/D, vertical C/D, the thickness of average RNFL, superior, inferior, temporal upper (TU), superior temporal (ST), superior nasal (SN), nasal upper (NU), nasal lower (NL), inferior nasal (IN), inferior temporal (IT), temporal lower (TL) quadrant RNFL thickness. Analysis of variance was performed for comparison among three groups. Minimum significant difference t test was performed for comparison between two groups.ResultsOptic disc structure parameters: there was no significant difference in the area of optic disc between the three groups (F=1.226, P＞0.05). The other optic disc parameters were significantly different in the three groups (F=5.221, 5.586, 6.302, 5.926, 5.319, 5.404, 5.861, 6.603; P＜0.05). The cup area, cup volume, C/D area, linear C/D, vertical C/D of the mild to moderate PD group and severe PD group were higher than that of the control group (P＜0.05). The cup area, cup volume, C/D area, linear C/D, vertical C/D of the severe PD group were higher than those of mild to moderate PD group (P＜0.05), the rim area, rim volume and disc volume of the severe PD group were smaller than that of mild to moderate PD group (P＜0.05). The thickness of RNFL: there was no significant difference between the three groups of ST, SN, NU and NL (F=3.586, 2.852, 2.961, 2.404; P＞0.05). The average thickness of RNFL, TU, IN, IT and TL in patients of the mild to moderate PD group and severe PD group were less than that in the control group (P＜0.05). The thickness of the average RNFL, TU, IN, IT and TL in patients of the severe PD group were less than that in the mild to moderate PD group (P＜0.05). With the increase of PD severity, the RNFL of TL and TU thinned most significantly.ConclusionsWith the increase of the severity of PD, the optic disc structure and RNFL thickness changes obviously, showing reduced optic disc area and volume, enlarged cup area and volume significantly enlarged C/D ratio. The average RNFL thickness of PD patients is significantly thinner than that of the controls, and it is the most obvious in the TU and TL quadrant.