Table 1. Normalized frequency of rat RGCs in control and NMDA-induced groups.

Group	Normalized frequency (%)
	Total RGCs	Large RGCs	Medium RGCs	Small RGCs
Control	100.00±1.84%	6.26±0.75%	10.42±0.23%	83.31±1.64%
NMDA-induced	59.33±6.76%‡	4.41±0.96%	6.43±0.99%†	46.74±5.92%‡

RGCs were classified as small, medium and large groups based on their soma sizes: small = <9.4 µm; medium = 9.4–12.6 µm; large = >12.6 µm (mean ± standard error of the mean, n = 8). The number of RGCs was normalized with total RGCs of control group. Control and NMDA-induced groups were statistically analyzed by the Student's t-test. *P<0.05,

^†P<0.01 and

^‡P<0.001.