Internal calibration for auto-phoropter

A vision testing system (100) capable of automated calibration comprising:

• a. a phoropter (110) capable of measuring the ophthalmic aberration of an eye, and providing the necessary correction, the phoropter (110) comprising:
• i. a wavefront sensor (111);
• ii. one or more lenses (112) calibrated using an initial correlation factor;
• iii. a model eye (113) disposed within the phoropter (110) for internal calibration;
• and
• iv. a light redirection component (116) disposed within the phoropter (110);
• wherein the light redirection component (116) is capable of redirecting light into the model eye (113) to determine an optimal correlation factor.

A method for automated internal calibration of a vision testing system, the method comprising:

• a. providing an automatic phoropter (110) capable of measuring the ophthalmic aberration of an eye, and providing the necessary correction, the phoropter component (110) comprising:
• i. a wavefront sensor (111) configured to measure the ophthalmic aberration of the eye;
• ii. one or more lenses (112) configured to correct the measured ophthalmic aberration;
• iii. an internal model eye (113) disposed within the phoropter (110) for internal calibration;
• iv. a first optical path (114) between the wavefront sensor (111) and a test position for the eye;
• v. a second optical path (115) between the wavefront sensor (111) and the internal model eye (113);
• and
• vi. a light redirection component (116) configured to selectively enable either testing via the first optical path (114) or calibration via the second optical path (115);
• b. accepting a recalibration request;
• c. enabling the optical path;
• d. measuring an ophthalmic aberration of the model eye (113) via the wavefront sensor (111);
• and
• e. determining an optimal correlation factor based on a difference between the measured aberration of the model eye (113) and a known value.