Visionstar SK-850

Automatic Calibration at Switch On

The software reads a digital calibrated array from the coated lenses on the projection head each time the instrument powers up, so brightness is not left to drift with supply conditions or bulb decay.

Calibrated Luminance Range

Optical gradual coating controls lens transmittance to deliver a range of 0 to 10000 asb, listed as 0 to 51 dB, in compliance with the international standard.

Kinetic Modes and Adjustable Speed

Kinetic modes list a standard program, static points, a scotoma map, a blind spot map and custom programs, with stimulus speed adjustable from 1 to 9 degrees per second.

Spot Control Across the Bowl

Software control, an imaging diaphragm and movement of the projection head keep the moving spot correctly lit and in focus as the projection distance changes.

Full Static Programme Set

Threshold programs list macula, 10-2, 24-2, 30-2, 60-4 and nasal step, alongside a screening set running from C-40 through to FF-246 and the Armaly programs.

Specialty and User Defined Programs

Esterman monocular, Esterman binocular, a monocular 150 degree field, superior 36 and superior 64 are listed, with storage for ten user defined programs.

Optical Coating Turnplate

A turnplate carries red at 610nm, blue at 440nm and white at 580nm. Five apertures with a focusing turnplate keep the spot free of chromatic aberration and evenly lit.

Infrared Eye and Fixation Monitoring

Infrared light monitors eye position and prompts head and chin rest adjustment, while a three dimensional gaze tracking curve is recorded across the X, Y and Z directions.

Kinetic Field Mapping

A moving target traces the boundary of a defect in a way a grid of fixed points cannot, which is why the kinetic modes matter. Scotoma maps and blind spot maps are listed as dedicated programs, and stimulus speed adjusts from 1 to 9 degrees per second so the examiner can slow down for a hesitant patient. Because the projection head moves while software and an imaging diaphragm hold the spot steady in luminance and focus, the boundary a clinician records reflects the field itself.

Glaucoma Detection and Monitoring

Threshold programs run from a tight macular pattern through 10-2, 24-2, 30-2 and 60-4 to a nasal step, covering the patterns clinicians reach for in glaucoma work. Glaucoma hemifield testing and glaucoma progression analysis are both listed in the software, alongside single field and multi field analysis. Together these turn a series of examinations into a statement about whether the disease is advancing, which is the judgement that drives treatment.

Occupational and Driving Assessment

Specialty programs list Esterman monocular and Esterman binocular tests together with a monocular 150 degree field, superior 36 and superior 64 procedures. Practices asked about fitness to drive or occupational vision have the recognised procedures to hand. Since these assessments carry real consequences for a person, the credibility evidence attached to the result carries weight of its own.

Colour and Short Wavelength Testing

The optical coating turnplate delivers red at 610nm, blue at 440nm and white at 580nm, and blue on yellow detection uses a Goldmann size V blue aperture against an OG530 yellow background. Short wavelength testing gives a second view of a field that may still look ordinary under white light, which suits patients under review for early change.

Calibration That Survives the Years

Perimetry compares a patient against themselves over a long period, so a drifting light source quietly corrupts everything built on it. Reading a calibrated array from the coated lenses at every power up, and controlling lens transmittance through optical gradual coating, means the brightness reference is re-established each session against the international standard. Bulb decay and unstable supply conditions stop being sources of error, and a field recorded this year remains comparable with one recorded several years ago.

Moving and Static Testing on One Instrument

Kinetic modes with adjustable stimulus speed sit beside a static programme set running from macula out to 60-4 and a screening list reaching FF-246. A clinic holding both can map an advanced defect by its boundary and quantify a subtle one point by point, without asking the patient to attend a second appointment elsewhere. For neurological questions in particular, the moving stimulus is often the one that answers the question.

Evidence About the Result Itself

Infrared monitoring watches eye position and prompts head and chin rest correction when a patient drifts, which reduces the inaccuracy an uncooperative or tired patient introduces. A three dimensional gaze tracking curve across the X, Y and Z directions is recorded, and creditability analysis is listed in the software. The clinician therefore receives not only a field but a basis for judging how much of it to believe.

The Visionstar SK-850 is a perimeter that takes both halves of the discipline seriously. Kinetic modes cover a standard program, static points, scotoma and blind spot maps and custom work at stimulus speeds from 1 to 9 degrees per second, while the static side runs from macula through 10-2, 24-2, 30-2 and 60-4 to a screening list reaching FF-246 and the Armaly programs. Underneath sits optical gradual coating delivering 0 to 10000 asb, listed as 0 to 51 dB, re-established against the international standard at every switch on.

This page states what the supplied material states. Housing dimensions, mass, electrical supply, software version, the exact model designation, configuration and condition do not appear on that material, and nothing here should be read as a claim about testing or regulatory approval. Medigear.uk will confirm each of those points before a practice commits to it.

If your practice needs kinetic mapping alongside conventional threshold work, or handles occupational vision questions, and you want the specification checked against the patients you actually see, speak to Medigear.uk. As a verified medical equipment supplier working across medical, dental, rehabilitation and aquatic therapy settings, the team will confirm what this instrument offers and help you judge whether it belongs in your clinic.