Patent ID: 7407286

Claim:
A device for determining a chemical composition of a living eye, the device comprising: a light emitting unit configured to emit a light beam; a light guidance unit including at least one first focusing lens having an entry surface and an exit surface to be brought in optical contact with the eye to illuminate at least part of said eye with the light beam emitted by said light emitting unit and to receive and guide at least a fraction of a light beam leaving the eye towards the light detecting unit to determine the chemical composition of said eye by analyzing said fraction of light, wherein said light guidance unit is arranged to illuminate said part of the eye with the light beam having an oblique angle of incidence with respect to a visual axis of the eye, wherein said light guidance unit further includes a second focusing lens having an entry surface and an exit surface, and wherein said exit surface of the first focusing lens has a curvature conformal to a wave front of the light beam leaving said exit surface and impinging on said part of said eye.