The grand mean interocular retinal thickness asymmetry was 5.6 m ( 95 % confidence interval [ CI ] : 4.6-6 .5 ) and the grand mean intraocular retinal thickness asymmetry was 8.3 m ( 95 % CI : 6.8-9 .9 ) in the right eye and 8.4 m ( 95 % CI : 6.7-10 .0 ) in the left eye .