Biometry of the Eye
Dimensional measurements of the components within the eye
As the focus of a confocal system moves through a complex, multi-layered system such as the human eye, information from each surface is reflected back to the detector. This information can be used to measure the position and curvature of each surface. Figure 1 shows multiple scans of a human cornea with a precision of 2 microns.
Figure 1: Corneal scans, 2 microns precision
Such precision is made possible by use of a number of Lein’s proprietary alignment technologies (three patents filed this year).
Further developments in Lein’s optical systems have demonstrated the measurement of the curvature of both the anterior and posterior corneal surfaces. Consequently a single system combining measurement of surface position and curvature is feasible.
Other measurements within the eye include anterior chamber depth (Figure 2), for both crystalline and intraocular lenses.
Figure 2: Anterior chamber depth scan, showing both surfaces of the cornea and the anterior lens surface