Biometry

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 in 2007).

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 intraocular lens surgery.

Figure 2: Anterior chamber depth scan, showing both surfaces of the cornea and the anterior lens surfaces.