title: Reflectance and curvature of the inner limiting membrane at the foveola.
abstract: Light reflected specularly by the inner limiting membrane (ILM) provides information on the topography of the retinal surface. The ILM in the central part of the foveal pit acts as a concave mirror. Light reflected specularly by this mirror forms an image of the entrance pupil in front of the retina. In 15 normal subjects (ages 16-56 years) we have measured photometric and geometrical-properties of this image to derive two characteristics of the ILM: its reflectance rho at the foveola and its radius of curvature r in the central part of the fovea. rho and r are found to decrease significantly with age (p = 0.0073 and p = 0.01, respectively). The equations of the regression lines are log10 rho = -4.234 - 0.0118 age and radius r = 1484 - 13.6 age, respectively (age in years, r in micrometers).
authors.affiliation: Schepens Eye Research Institute, Boston, Massachusetts 02114, USA. j-marie.gorrand@u-clermont1.fr
authors.forename: J M
authors.initials: JM
authors.lastname: Gorrand
authors.forename: F C
authors.initials: FC
authors.lastname: Delori
mesh_terms: D000293:Adolescent; D000328:Adult; D000375:Aging / Q000502:physiology; D005260:Female; D005584:Fovea Centralis / Q000033:anatomy & histology* / Q000502:physiology*; D005654:Fundus Oculi; D006801:Humans; D008027:Light; D008297:Male; D008433:Mathematics; D008875:Middle Aged; D010783:Photometry; D012160:Retina / Q000033:anatomy & histology* / Q000502:physiology*; D012542:Scattering, Radiation