A perimeter, including two types: one is a fixation forcing perimeter, and the other is an objective perimeter combined with electro-physiology under forced fixation; the perimeter comprises a fixation forcing device, a display conduction device, a perimetry display device, a feedback device for recording feedback information, and a control center for controlling the perimetry display device and collecting feedback information; the fixation forcing device comprises a negative pressure ring (2) and a negative pressure tube (3), and is adsorbed to the eyeball by negative pressure; when the eyeball moves, the fixation forcing device moves synchronously, and the fixation is forced at the same position, thereby eliminating the influence of a fixation point on the examination results of the perimeter; in the objective perimeter, an electro-physiological signal after forced fixation is automatically recorded by an electro-physiological instrument, so that the subjective response of a patient is eliminated, and the examination results are objective; and the change in the field of view can be early discovered using the electro-physiological signal as an analysis indicator.

Objective refraction error measuring apparatuses are known. Once the measurement is done, there is no known method for confirming if the measurements are correct. Disclosed is an apparatus (200) wherein once the error is measured, the determined values of the error are used to set the characteristics of a tunable lens (230) so as to correct the error in the vision of the subject. The objective error is measured again while the subject viewing through the tunable lens so set. Objective refraction error is again measured. If the error measured is now within predefined limits, the first measurement is deemed correct and the values are out put so that glasses with those values may be prescribed to the subject.

An optical measurement system and apparatus for carrying out cataract diagnostics in an eye of a patient includes a Corneal Topography Subsystem, a wavefront aberrometer subsystem, and an eye structure imaging subsystem, wherein the subsystems have a shared optical axis, and each subsystem is operatively coupled to the others via a controller. The eye structure imaging subsystem is preferably a fourierdomain optical coherence tomographer, and more preferably, a swept source OCT.

A method for assessing neurological function in a subject includes a) prompting a user to follow a moving saccade-evoking stimulus on a display, b) tracking eye movement of the subject while the user follows the moving stimulus, c) collecting a first eye conjugacy data of the subject relating to the saccade-evoking stimulus, and d) comparing the first eye conjugacy data with a second eye conjugacy data, the second eye conjugacy data relating to an anti-saccade stimulus.

Disclosed is a method for determining a parameter of an optical device including at least an optical lens, the method including: an optical system providing step, during which an optical system including a visual target, the optical device and an image acquisition module is provided in an initial configuration state, a parameter determining step during which a parameter of the optical device is determined based on the blur level of the images of the visual target acquired by the image acquisition module through the optical device in at least two different configuration states.

The present disclosure relates to a device for providing an eye metric, comprising a display unit (7), producing a visual stimulus (13) to an eye. An eye-tracking unit (9), measures the eye's movements in response to the stimulus, and an analyzing unit, outputting a metric result. The display unit (7) produces a moving stimulus with at least one varying stimulus parameter such as a symbol size, and the eye-tracking unit (9) detects when the eye loses visual contact with the stimulus. The analyzing unit provides a metric result based on the value of the stimulus parameter at the time when loss of visual contact was detected.

A characteristic testing system may comprise a line of sight detection unit, a target display unit, a visual recognition determination unit, and a characteristic testing unit. The line of sight detection unit may detect a line of sight of the user and output information pertaining to a direction of the line of sight. The target display unit may cause targets to be displayed. The visual recognition determination unit may carry out determination as to whether or not the user has visually recognized targets. The characteristic testing unit may control the target display unit and carry out testing with respect to the characteristic of the user based on movement of the line of sight when the targets are displayed. The characteristic testing unit may comprise a multiple target testing unit that carries out testing with respect to the characteristic of the user when a plurality of targets are simultaneously displayed.

An imaging device and method is shown to image ocular tissue in motion. Devices and methods include at least one target to align the patient's eye at a desired angular orientation, multiple selectable target locations, and control circuitry to display the target at the multiple target locations and image ocular tissue at each multiple target location.

Ophthalmic imaging systems and related methods provide pseudo feedback to aid a user in aligning the user's eye with an optical axis of the imaging system. An ophthalmic imaging system includes an ophthalmic imaging device having an optical axis, a display device, an eye camera, and a control unit. The display device displays a fixation target viewable by the user. The eye camera images the eye to generate eye image data. The control unit processes the eye image data to determine a position of the eye relative to the optical axis, processes the position of the eye relative to the optical axis to generate a pseudo position of the eye relative to the optical axis, and causes the display device to display an indication that provides feedback to the user that the eye is located at the pseudo position of the eye relative to the optical axis.

A method for testing the eyes of a test person with the aid of a vision testing system as well as to a vision testing system, comprising a first measuring device, a second topographic measuring device, a third refractive measuring device and a processing means, a central axial length (L.sub.Z) and a peripheral axial length (L.sub.P) of an eye of the test person being measured with the aid of said first measuring device, a curvature of the cornea of the eye being measured with the aid of said second measuring device, a refractive property of the eye being measured with the aid of said third measuring device, measurement data of the measurements of the first, second and third measuring device being processed with the aid of said processing means, said processing means outputting the measurement data.