(a) Histological sections of retinas of 2-month-old RCS rat eyes. From left to right, the retina of an untouched animal (nontreated control), a retina where the lens was injured, and a retina of an eye contralateral to lens injury are shown. The black bars indicate the thickness of the outer nuclear layer. Scale bar: 50 μm. (b), (c) Numerical evaluation of the numbers of photoreceptor nuclei in the eyes of RCS rats: untouched animals (nontreated control), eyes with lens injury, and contralateral eyes. Age of the animals: (b) 2 months and (c) 3 months. Mean values are shown, with the error bars indicating standard deviations. Significance of difference compared to vehicle injection: *, **, and ***.