Device and method for estimating a refractive error from measured visual acuity

An automatic module for myopia control including a device (1;

• 1A;
• 1B;
• 1C) for estimating a refractive error of an eye of a user from visual acuity of said user's eye, said device comprising:
• at least one input adapted to receive at least two measurements of the visual acuity of said user's eye, called reference visual acuity measurements, and data related to at least two distinct levels of blur respectively associated with the reference visual acuity measurements, called reference blur data, the reference visual acuity measurements being performed within a reference measurement period by imposing said respective levels of blur on said user's eye;
• at least one processor configured for particularizing into a specific model for said user's eye a generic model involving a theoretical visual acuity (VA), theoretical blur data and a theoretical refractive error, from the reference visual acuity measurements and the reference blur data, and for producing information relevant to the refractive error of said user's eye from said specific model;
• and
• at least one output adapted to provide said information relevant to the refractive error of said user's eye.

A method for estimating by at least one processor a refractive error of an eye of a user from visual acuity of said user's eye, said method comprising:

• receiving at least two measurements of the visual acuity of said user's eye, called reference visual acuity measurements, and data related to at least two distinct levels of blur respectively associated with the reference visual acuity measurements, called reference blur data, the reference visual acuity measurements being performed within a reference measurement period by imposing said respective levels of blur on said user's eye;
• particularizing into a specific model for said user's eye a generic model involving a theoretical visual acuity, theoretical blur data and a theoretical refractive error, from the reference visual acuity measurements and the reference blur data, and producing information relevant to the refractive error of said user's eye from said specific model;
• and
• providing said information relevant to the refractive error of said user's eye.