Apparatus and method for measuring spectrum image data of eyeground

Abstract

The object of the invention is to provide a favorable spectral characteristic that reduces variation depending on the frequency of received light intensity, and that is gentle on a subject eye. It also eliminates displacement between positions of respective spectral images of the same part even if a change in alignment occurs between the eye and apparatus with the lapse of time. An apparatusfor measuring spectral fundus image data of this invention comprises: an illumination optical systemhaving an illumination light sourcethat emits a light beam in a specified wavelength range; a light receiving optical systemfor forming a fundus image on the light receiving surface of a photographing section; a liquid crystal wavelength tunable filtercapable of choosing a wavelength of a transmitted light beam in a specified wavelength range; a spectral characteristic correction filterhaving wavelength characteristic for correcting the wavelength characteristic of the emitted light intensity of the illumination light sourceand the transmission wavelength characteristic of the wavelength tunable filterso that the received light intensity on the light receiving surface is kept within the specified range; and a data measuring sectionfor taking the spectral fundus image data from the light receiving surface while changing the wavelength of the light beam passing through the wavelength tunable filter