Visionstar ARK-8000

Patients Who Need Assistance

Automatic alignment and a display tilting through 120 degrees address one difficulty directly. Where an eyelid must be held open or a patient steadied, an operator working a joystick has no hand free. An instrument that finds the eye itself, with a screen angling to wherever the operator stands, lets assistance and measurement happen together. The 2.0mm minimum pupil requirement also helps with older patients and brightly lit rooms.

Contact Lens Fitting

Keratometry from 5.00 to 10.00mm at 0.01mm steps, corneal astigmatism to plus or minus 10 dioptres and a size function reaching 12.7mm describe the surface a lens must sit on. Peripheral keratometry at 6.0mm adds measurement away from the corneal centre, which matters because a lens rests on more than the apex and a central reading alone can mislead about how it will sit on that particular eye.

High Prescriptions and Difficult Refractions

A sphere range reaching plus or minus 25.00 dioptres extends well beyond ordinary spectacle prescriptions, covering aphakic and highly ametropic eyes that a narrower instrument would fail to measure. Step sizes selectable at 0.01, 0.12 or 0.25 dioptres let a practitioner work at the resolution the case warrants rather than at a fixed increment chosen for them.

Connected Pre Testing and Records

RS-232C, D-sub video out and optional RFID connect the instrument to an auto vision tester, an auto lensmeter, a PC and EMR or EHR protocol systems. Figures then move between instruments and into the patient record without being read off one screen and typed into another, which is where transcription errors ordinarily enter a clinical record most often.

A Hand Freed for the Patient

Removing the joystick sounds like a convenience and is actually a change in what the operator can do. Elderly patients, children and anyone with a ptosis or a fixation difficulty may need physical help to be measured at all, and an operator whose hands are occupied cannot give it. Automatic alignment with a 120 degree tilting screen means the person operating can attend to the patient and still read the display clearly.

Measurement Beyond the Ordinary Range

Sphere to plus or minus 25.00 dioptres, cylinder to plus or minus 10, and peripheral keratometry at 6.0mm take the instrument past what a general purpose unit covers. Practices seeing aphakic patients, high myopes or complex contact lens fits are exactly the ones a narrower instrument fails, and they are usually the patients who most need a reliable objective starting figure before subjective testing begins.

Results That Move by Themselves

Serial, video and optional wireless interfaces mean figures reach a printer, other pre test instruments and the practice record system without being retyped. Every manual transfer of a number is an opportunity for a digit to change, and in refraction a transposed figure is not obvious on inspection. Equipment that passes its own results along removes that risk instead of merely managing it.

Fully Automatic Alignment

The correct position of the patient's eye is found automatically by internal software, with alignment and measurement also available by touching the screen alone.

Wide Sphere Range

Sphere is measured from minus 25.00 to plus 25.00 dioptres at a 12mm vertex distance, in selectable steps of 0.01, 0.12 or 0.25 dioptres.

Cylinder, Axis and Pupil

Cylinder covers 0 to plus or minus 10 dioptres in the same step options, axis runs 1 to 180 degrees in 1 degree steps, and required minimum pupil is 2.0mm.

Keratometry Measurement

Radius of curvature is measured from 5.00 to 10.00mm in 0.01mm steps, with refractive power from 33.75 to 67.50 dioptres at a refractive index of 1.3375.

Peripheral Keratometry

Peripheral measurement is taken at 6.0mm with r equal to 7.8, extending keratometry beyond the central cornea for a fuller picture of the surface.

Retro Illumination and Size

Retro illumination views the eye against the fundus reflex, and a size function measures cornea and pupil dimensions across a range of 0 to 12.7mm.

Tiltable High Resolution Display

A wide 7 inch TFT LCD tilts through 120 degrees, running at 800 by 480 pixels with a luminance of 400 candela per square metre.

Printer and Interfaces

An external thermal printer with auto loading and cutting is supplied, with RS-232C, D-sub video out and optional RFID for connection to other practice equipment.

The Visionstar ARK-8000 combines automatic operation with an unusually wide measurement range. Sphere covers minus 25.00 to plus 25.00 dioptres at a 12mm vertex distance with 0.01, 0.12 or 0.25 dioptre steps, cylinder reaches plus or minus 10 dioptres, and axis runs 1 to 180 degrees. Keratometry measures 5.00 to 10.00mm radius and 33.75 to 67.50 dioptres at an index of 1.3375, with peripheral measurement at 6.0mm and size measurement to 12.7mm. Peripheral keratometry, retro illumination and corneal or pupil size functions are all listed, alongside a 120 degree tilting 7 inch TFT LCD at 800 by 480 pixels. The instrument measures 458 by 210 by 405mm and weighs approximately 13kg.

The mains electrical specification printed on the data is deliberately not reproduced here, and software version, accessories, configuration and condition do not appear on the material held. Nothing here should be read as a claim about testing or regulatory approval. Medigear.uk will confirm each of those points.

If your practice wants an instrument that aligns itself, reaches beyond ordinary prescription ranges and passes its results onward, 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 how it would connect to what you already run.