Mouse experimental myopia has features of primate myopia.
OBJECTIVE
Several recent studies have suggested that experimental myopia can be induced in mice. However, it is not clear what role the photopic visual input plays in this process and whether mouse myopia is similar to human myopia. The purpose of this study was to carry out an in vivo high-resolution analysis of changes in ocular components and refractive state of the eye upon induction of experimental myopia in mice.


METHODS
A high-resolution small animal MRI system and a high-resolution automated eccentric infrared photorefractor were used to analyze changes of the refractive state and ocular components in C57BL/6J mice associated with experimental myopia induced by diffusers and -25 D lenses under photopic conditions.


RESULTS
The authors found that both diffusers and -25 D lenses induce myopia in C57BL/6J mice under photopic conditions (continuous light, 200 +/- 15 lux). The extent of myopic shift induced by -25 D lenses was greater than the shift induced by diffusers (-15.2 +/- 0.7 D, lenses; -12.0 +/- 1.4 D, diffusers). Myopia in mice is attributed to an increase in size of the postequatorial segment of the eye. Experimental myopia in mice can be induced only during the susceptible period in postnatal development, which ends around postnatal day 67.


CONCLUSIONS
Both diffusers and spectacle lenses induce myopia in mice under photopic conditions, during the susceptible period in postnatal development. Myopia in mice is associated with elongation of the vitreous chamber of the eye, as in humans and nonhuman primates.
Tkatchenko
Tatiana V
TV
Department of Anatomy and Cell Biology, Wayne State University, Detroit, Michigan 48201, USA. atkatche@med.wayne.edu
Shen
Yimin
Y
Tkatchenko
Andrei V
AV
D000818:Animals; D003261:Contact Lenses; D004195:Disease Models, Animal; D005139:Eyeglasses; D006801:Humans; D008027:Light; D008279:Magnetic Resonance Imaging; D051379:Mice; D008810:Mice, Inbred C57BL; D009216:Myopia / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D009885:Ophthalmology / Q000295:instrumentation; D012029:Refraction, Ocular / Q000502:physiology; D012031:Refractometry; D012683:Sensory Deprivation; D014822:Vitreous Body / Q000473:pathology