title: A focus on the optical properties of the regenerated newt lens.
abstract: Lens regeneration studies in the adult newt suggest that molecular aspects of lens regeneration are complete within 5 weeks of lentectomy. However, very little is known about the optical properties of the regenerated lens. In an aquatic environment, the lens accounts for almost all of the refractive power of the eye, and thus, a fully functional lens is critical. We compared the optical properties of 9- and 26-week regenerated lenses in the red spotted newt, Notophthalmus viridescens, with the original lenses removed from the same eyes. At 9 weeks, the regenerated lenses are smaller than the original lenses and are histologically immature, with a lower density of lens proteins. The 9 week lenses have greater light transmission, but significantly reduced focal length and refractive index than the original lenses. This suggests that following 9 weeks of regeneration, the lenses have not recovered the functionality of the original lens. By 26 weeks, the transmission of light in the more mature lens is reduced, but the optical parameters of the lens have recovered enough to allow functional vision.
authors.affiliation: Ottawa Hospital Research Institute, Vision Research Program, Ottawa, Ontario, Canada ; Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: Sarah
authors.initials: S
authors.lastname: Wassmer
authors.forename: Margaret
authors.initials: M
authors.lastname: Beddaoui
authors.forename: Payman
authors.initials: P
authors.lastname: Rajai
authors.forename: Réjean
authors.initials: R
authors.lastname: Munger
authors.forename: Catherine
authors.initials: C
authors.lastname: Tsilfidis
mesh_terms: D000818:Animals; D007908:Lens, Crystalline / Q000502:physiology* / Q000601:surgery; D008027:Light; D009673:Notophthalmus viridescens / Q000502:physiology*; D009799:Ocular Physiological Phenomena; D055095:Optics and Photonics; D012031:Refractometry; D012038:Regeneration; D012160:Retina / Q000502:physiology; D013997:Time Factors; D014785:Vision, Ocular