Traductions en contexte français - anglais

The invention relates to a novel optotype for measuring visual acuity.

Ophthalmic optics - Visual acuity testing - Standard optotype and its presentation

Ophthalmic optics — Visual acuity testing — Standard optotype and its presentation

A fixation optotype and a optotype display mode by a conventional perimeter are very monotonous.

Visual acuity (VA) is measured with a Snellen tumbling E chart, using optotype size 18 (60) on one side and size 60 (200) on the other side at a 6 or 3 metre distance.

Visual acuity was measured by a doctor using a Snellen tumbling “E” chart, with optotype size 6/18 (20/60) on one side and size 6/60 (20/200) on the other side, at a distance of 6 or 3 m.

In at least one embodiment, a vision test includes at least one animated dynamic optotype image for measuring the visual acuity of a subject.

For example, starting with a large optotype, the size is steadily decreased until the patient signals that he can no longer read the optotype.

An output unit (3) presents an optotype for the latent time of saccade or less in an area visible to the subject.

The visual acuity is the ability to discern a small object (an optotype) located as far as possible, i.e. the ability to see an optotype at a fixed distance (usually five meters) under the smallest possible angle.

The test then continues starting from a small optotype and steadily increasing the size until the patient signals that he can read the optotype.

This was selected as it matched the type size for newsprint in the country.

A fixed optotype (41) is arranged in the center of the lattice optotype (3), and a vertically-striped pattern consisting of two complementarily-related colors is formed in the circular optotype (4).

This optotype illustrates the level of illiteracy of the population at that time as well, because there are no letters or numbers on it.

To this end, a test person (16) with a dilated pupil, preferably inside a darkened room (12), is presented at least one optotype at a distance (a) of several meters.