We have designed a Wide-Field Digital Holography (WF-DH) system for metrology of
ophthalmic lenses over the full field of view within a single camera acquisition. For the
developed WF-DH system, the reflection wavefront from the object surface is recorded
as a digital hologram using a modified Michelson interferometer. The wide-field of view
is achieved by employing a telecentric lens geometry. The recorded hologram is
reconstructed to obtain the phase of the lens under test and analyzed for measurements.
The information obtained is utilized for verifying the vision correction capability of the
test lens using ZEMAX simulations. The proposed system is capable of providing
precise measurements of Radius of curvature, diameter, thickness and power of lenses
with an error of ±1.3%. The measurement is done with non-contact imaging which is
different from the current industrial methods like surface contact stylus profilometry or
interferometry techniques which utilize reference surface for metrology of optical lenses.
Keywords: Digital Holography, Ophthalmic Lens, Wide Field of View, Telecentric
Lens.

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