Table 1.

Photopic visual acuity in various mouse strains

Mouse strains	1.85 log cd m−2	2.57 log cd m−2	p2	RPE65 variant
Irbp+/+Tα−/− (n = 5)	0.71 ± 0.01	0.80 ± 0.02	0.002
Irbp−/− Tα−/− (n = 5)	0.66 ± 0.02	0.69 ± 0.02	0.22	Leu450
p1	0.041	0.003
129S2/Sv (n = 5)	0.74 ± 0.01	0.78 ± 0.01	0.04
Irbp−/− [129S2/Sv] (n = 5)	0.66 ± 0.03	0.69 ± 0.02	0.41	Leu450
p1	0.019	0.007
C57Bl/6 (n = 5)	0.74 ± 0.02	0.82 ± 0.02	0.02
Irbp−/− [C57Bl/6] (n = 3)	0.71 ± 0.03	0.78 ± 0.02	0.15	Met450
p1	0.50	0.24

Values are given in cycles per degree. Data were derived from mouse optomotor responses to rotating gratings under two photopic background illumination conditions (1.85 or 2.57 log cd m⁻²). Values are means ± SEM. Significance levels: p₁ values indicate comparisons between specified pairs of mouse strains (within the same background light intensity); and p₂ values indicate comparisons within the same mouse strain (between two different illumination conditions).