Dual-Purkinje-Image Eyetracker

 

The Dual-Purkinje-Image Eyetracker was developed at Stanford Research Institute, International (SRI) under a NASA contract.  Mr. Ward was a consultant at SRI and took over the technology in 1988.  He has been manufacturing and servicing them since 1988.  This instrument is the world standard for eye movement research.

 

EYETRACKER OPTIONS available:

 

INFRARED OPTOMETER

The WARD ELECTRO-OPTICS, INC. (WARDELEX) OPTOMETER is a real-time +/- 10 diopter Optometer that attaches to the WARDELEX DPI EYETRACKER and tracks changes in accommodation while the EYETRACKER tracks in the X/Y axis. The OPTOMETER can be attached to an existing EYETRACKER or be provided with new units. The OPTOMETER displays continuous accommodation changes on a front-panel meter and an additional analog output BNC. Calibration is provided by the end user.  Resolution is .1 Diopter.

 

STIMULUS DEFLECTOR

The WARDELEX STIMULUS DEFLECTOR, also called the STABILIZER, is an option that allows the horizontal and vertical rotational outputs of the EYETRACKER to be fed back to a pair of X/Y galvanometers that are in the optical path. With proper adjustment the “real world” fixation targets can be stabilized at the retina. There is also another option offered to the STABILIZER that allows a focus stimulus in the “Z” axis for a 3-D system. With the STIMULUS DEFLECTOR you also have control over spherical correction (focus) and provision for the placement of trial lenses (cylindrical correction).

 

SCOTOMA DEVICE

The WARDELEX SCOTOMA DEVICE is an attachment to the STIMULUS DEFLECTOR, which allows a scotoma image of any shape to be stabilized on the retina, while the “real world” remains unstabilized. These “scotomas” are created on a glass plate that block a portion of viewing area and simulates retinal pathologies.

 

FUNDUS ILLUMINATION AND MEASURING INSTRUMENT (FIMI)

The WARDELEX FUNDUS ILLUMINATION AND MEASURING INSTRUMENT (FIMI) option allows real-time binocular viewing of the retina by a white-light or infrared source, while a stabilized low-power 635nm pilot laser beam is stabilized by the operator on the retina.