Method for determining a refraction feature of an eye of a subject, and associated portable electronic device

A method for determining a refraction feature of an eye of a subject using a portable electronic device, said portable electronic device including:

• a light source adapted to illuminate a pupil of said eye of the subject;
• and
• an image-capture apparatus adapted to acquire pictures of said pupil illuminated by said light source,
• said method comprising the steps of:
• a) illuminating said pupil of the eye of the subject by means of said light source;
• b) acquiring a picture of said pupil of the eye of the subject comprising an image of the reflection of said light source on the retina of said eye of the subject;
• c) determining said refraction feature of said eye of the subject taking into account at least one of the following features of said image of the reflection of said light source:
• a geometrical feature of said image of the reflection of said light source,
• a positional feature of said image of the reflection of said light source,
• an intensity distribution within said image of the reflection of said light source;
• wherein said portable electronic device being held by the subject himself in front of his eyes,
• said step a) comprises displaying, on a screen of said portable electronic device, a lighted area forming said light source, and
• in step b) said reflection of said light source is collected by said image-capture apparatus,
• wherein a plurality of pictures of said pupil of the eye of the subject comprising an image of the reflection of said light source on the retina of said eye of the subject are acquired,
• wherein the posture of the head of the subject relative to said light source is different while each of said pictures are acquired, and in step c), said refraction feature is determined taking into account at least a geometrical feature and/or a positional feature and/or an intensity distribution of each of the images of the reflection of said light source on each picture acquired, and
• wherein steps a) and b) are repeated in order to capture said plurality of pictures, and
• in each of the repeated steps a), the lighted area is centered at a different predetermined distance from the center of the entrance pupil of the image-capture apparatus, the relative position of the image-capture apparatus and the eye of the subject remaining the same,
• in each of the repeated steps b), the picture of the pupil of the eye of the subject is acquired while the picture comprises the image of the reflection of said lighted area centered at said different predetermined distance from the center of the entrance pupil of the image-capture apparatus.