Method for determining an ophthalmological parameter

An apparatus for determining one or more facial anatomical parameters of a subject including a frame to be placed on the subject, the frame including means for determining the shape of at least one part of the nose of the subject, said determination means delivering information representative of said shape.

A method of determining at least one ophthalmological parameter of a subject, the at least one ophthalmological parameter being the interpupillary half-distances, the method comprising:

• observing both eyes of the subject by a gaze tracking device worn by the subject and determining said parameter at least from said observation,
• wherein the gaze tracking device comprises at least one left optical sensor and at least one right optical sensor, the optical sensors each including a video camera,
• wherein a position of a rotation center of the eyes of the subject is determined and/or wherein a position of pupils of the subject is determined when their gaze is focused at infinity.

A method of determining at least one ophthalmological parameter of a subject, the at least one ophthalmological parameter being the interpupillary half-distances, the method comprising:

• observing both eyes of the subject by a gaze tracking device worn by the subject and determining said parameter at least from said observation,
• wherein the gaze tracking device comprises at least one left optical sensor and at least one right optical sensor, the optical sensors each including a video camera,
• the method further comprising displaying on a transparent or non-transparent screen one or more test patterns and/or one or more patterns intended to be seen by the subject.