Retinal topography diffractive fundus lens
View Patent ↗Embodiments of the present invention provide a fundus lens. This fundus lens includes a first aspheric lens and a second aspheric lens and a diffractive optical element. This diffractive optical element is placed between the first and second aspheric lens and illuminated by an off access light source. The diffractive optical element contains a predetermined pattern which may be directed and imaged on a fundus. The first and second aspheric lenses are operable to gather light scattered by the fundus and provide the gathered light to a fundus camera. This fundus camera may then be operable to process the gathered light and determine the topography of the fundus.
1. A diffractive fundus lens, comprising:
a first aspheric lens;
a second aspheric lens;
an off-axis light source;
a diffractive optical element, wherein the DOE is illuminated by the off-axis light source; and
wherein:
the DOE, when illuminated, projects a desired pattern on a fundus;
the first and second aspheric lenses are operable to gather light scattered by the fundus, and direct the gathered light into a fundus camera.
2. The diffractive fundus lens of claim 1 , wherein the off-axis light source further comprises:
a laser source operable to produce laser light; and
at least one optical element operable to direct the laser light to the DOE.
3. The diffractive fundus lens of claim 1 , wherein the desired pattern is stored within the DOE.
4. The diffractive fundus lens of claim 3 , wherein the DOEstores the desired pattern holographically.
5. The diffractive fundus lens of claim 3 , wherein the desired pattern is a computer generated pattern.
6. The diffractive fundus lens of claim 1 , wherein the DOE has a low efficiency.
7. The diffractive fundus lens of claim 1 , wherein the fundus camera analyzes the gathered light to determine the topography of the fundus.
8. The diffractive fundus lens of claim 1 , wherein the fundus comprises an optical retina.