Ophthalmological imaging method, device and system
An ophthalmological topographer is disclosed. The ophthalmological topographer includes a corneal topographer and a scleral measurement device including one or more scleral projection systems. Methods of determining topography are also disclosed.
1. An ophthalmological topographer comprising:
a corneal topographer; and
a scleral measurement device comprising one or more scleral projection systems,
wherein each of the one or more scleral projection systems comprise a scleral reference object comprising at least one diaphragm comprising two or more adjacent registration apertures through which light can propagate and be disposed onto a cornea.
2. The ophthalmological topographer of claim 1 , wherein the corneal topographer directs a reference object on an eye surface.
3. The ophthalmological topographer of claim 2 , wherein the directed reference object comprises a projected reference object or mires.
4. The ophthalmological topographer of claim 2 , comprising an imaging system imaging the reference object directed onto said eye surface through a central channel in the topographer body.
5. The ophthalmological topographer of claim 1 , further comprising a topography illumination source.
6. The ophthalmological topographer of claim 1 , wherein each of the one or more scleral projection systems comprise a scleral projection light source.
7. The ophthalmological topographer of claim 6 , wherein the one or more apertures are disposed in an aperture pattern.
8. The ophthalmological topographer of claim 6 , wherein the one or more apertures comprise a scleral aperture pattern.
9. The ophthalmological topographer of claim 8 , wherein when imaged on an eye or an imaging sensor, the scleral aperture pattern is imaged as one or more scleral locators.
10. The ophthalmological topographer of claim 8 , wherein the scleral aperture pattern illuminated by the scleral projection light source is imaged onto the projection imaging system and onto a scleral portion of an eye surface.
11. The ophthalmological topographer of claim 6 , wherein the one or more apertures comprise a corneal aperture pattern.
12. The ophthalmological topographer of claim 11 , wherein when imaged on an eye or an imaging sensor, the corneal aperture pattern is imaged as a corneal scatter image.
13. The ophthalmological topographer of claim 11 , wherein the corneal aperture pattern illuminated by the projection light source is imaged onto the projection imaging system and onto a cornea.
14. The ophthalmological topographer of claim 6 , wherein the one or more apertures comprise a scleral aperture pattern and a corneal aperture pattern.
15. The ophthalmological topographer of claim 1 , wherein each of the one or more scleral projection systems further comprise a scleral projection imaging system.
16. The ophthalmological topographer of claim 1 , wherein the one or more scleral projection systems are symmetrically mounted on the topographer.
17. The ophthalmological topographer of claim 1 , further comprising one or more scleral registration reference object projector.
18. The ophthalmological topographer of claim 17 , wherein the scleral registration reference object projector comprises a scleral reference light source and a scleral registration reference object.
19. The ophthalmological topographer of claim 18 , wherein the scleral registration reference object projector comprises a registration reference object light guide.
20. The ophthalmological topographer of claim 18 , wherein light from the scleral reference light source passing through the scleral registration reference object and reflected from an eye surface forms at least a part of a scleral image.
21. The ophthalmological topographer of claim 20 , wherein light from the scleral image is digitally processed to obtain corneal height information and scleral height information.
22. The ophthalmological topographer of claim 21 , wherein the processed scleral image is used to combine the corneal height information from the topographer with the scleral height information into a new scleral topographic map.
23. The ophthalmological topographer of claim 22 , wherein the projected scleral aperture pattern on the eye surface and the registration diaphragm may be imaged together on a same scleral image onto one or more capture system.
24. The ophthalmological topographer of claim 22 , wherein the one or more scleral reference object apertures and/or the scleral registration apertures are imaged on one or more imaging sensor by an imaging system.
25. The ophthalmological topographer of claim 1 , further comprising a processor to combine scleral height information acquired from the scleral measurement device and corneal height information from the corneal topographer.
26. The ophthalmological topographer of claim 1 , wherein the scleral measuring device further applies an algorithm to improve accuracy of the scleral height information by comparing an eye reference axis of a scleral image to an eye reference axis of a corneal image.