Patent ID: 7134754

Claim:
A retinal function camera comprising: a first source of light of a first wavelength band; a second source of light of a second wavelength band, the absorptivity of light of the first wavelength band by oxygenated blood being greater than the absorptivity of light of the second wavelength band and the absorptivity of light of the first wavelength band by deoxygenated blood being less than the absorptivity of light of the second wavelength band; means for focusing light selectively from the first and second sources on a portion of a retina of an eye; imaging means for producing respective images of a portion of the retina illuminated with the respective wavelength bands; and processing means adapted to process the respective images obtained by the imaging means to determine isoreflective points of the respective images at which absorption of light of the first wavelength is substantially equal to absorption of light of the second wavelength and areas of the respective images having differential absorptivity for the first and second wavelengths, to obtain a retinal function image based on haemoglobin oxygenation.