Abstract: Retinal metabolism is analyzed with a retinal function camera over at least a portion of a cardiac cycle by first illuminating a portion of a retina of an eye 10 with light of a first wavelength and producing a first image. The portion of the retina is subsequently illuminated with light of a second wavelength, the first and second wavelengths being selected such that absorptivity of light of the first wavelength by oxygenated blood is greater than absorptivity of light of the second wavelength and the absorptivity of light of the first wavelength by deoxygenated blood is less than absorptivity of light of the second wavelength, to produce a second image. The first and second images are processed to map relative oxygenation of the portion of the retina as an indication of retinal metabolic function of the portion of the retina.

Abstract: Disclosed is a cervical protective device that reduces the possibility of neck injuries in contact sports. In a preferred embodiment, this device is worn in conjunction with a football helmet and football shoulder pads. Without restricting normal movement of a football player, the device contacts the lower most parts of the sides of the helmet and has a shape that is molded as to the normal anatomy of the upper back and lower cervical spine. The device contacts the lower sides of the player's neck and is held in place by the shoulder pads as normally worn by football players. Force received at the top of the helmet is applied to the protective device, absorbed by compression elements contained within the protective device and the force is directed away from the cervical spine.

Abstract: A retinal camera is used to examine an eye, the camera including a light source having first and second sources emitting first and second wavelength bands. The first and second light sources are arranged to alternately produce light onto the retina such that the absorptivity of light of the first wavelength band by oxygenated blood is greater than the absorptivity of light of the second wavelength band, and the absorptivity of light of the first wavelength band by the oxygenated blood is less than absorptivity of light of the second wavelength band. Light is selectively focused from the first and second sources by an optical arrangement and imaging devices produce respective images of a portion of the retina illuminated with the respective wavelength bands. The images obtained by the imaging device are processed by the imaging device and processor to determine a retinal metabolic image based on haemoglobin oxygenation. In an embodiment of the invention light is scanned across the retina.

Abstract: Retinal metabolism is analysed with a retinal function camera over at least a portion of a cardiac cycle by first illuminating a portion of a retina of an eye 10 with light of a first wavelength and producing a first image. The portion of the retina is subsequently illuminated with light of a second wavelength, the first and second wavelengths being selected such that absorptivity of light of the first wavelength by oxygenated blood is greater than absorptivity of light of the second wavelength and the absorptivity of light of the first wavelength by deoxygenated blood is less than absorptivity of light of the second wavelength, to produce a second image. The first and second images are processed to map relative oxygenation of the portion of the retina as an indication of retinal metabolic function of the portion of the retina.

Abstract: A retinal camera 101 is used to examine an eye 10, the camera including a light source 1 having first and second sources 21, 22 emitting first and second wavelength bands. The first and second light sources are arranged to alternately produce light onto the retina such that the absorptivity of light of the first wavelength band by oxygenated blood is greater than the absorptivity of light of the second wavelength band, and the absorptivity of light of the first wavelength band by the oxygenated blood is less than the absorptivity of light of the second wavelength band. Light is selectively focused from the first and second sources by an optical arrangement 30, 50, 60, 80 and 90 and imaging devices 90, 120, 130 produce respective images of a portion of the retina illuminated with the respective wavelength bands. The images obtained by the imaging device are processed by the imaging device and processor 140 to determine a retinal metabolic image based on haemoglobin oxygenation.