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This visual field screening is provided for patients of Paddy Kalish OD. Please enter the access code the office gave you, then tap Continue.

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Visual Field Screening Test

A perimeter-style screening of your central 24° visual field — the same test pattern (24-2) used on clinical Humphrey perimeters — adapted for a computer screen. One eye at a time, about 2–3 minutes per eye.

Screening only — read this first. This is a screening tool, not a diagnosis, and it does not replace clinical perimetry or an eye examination. Like all visual field testing it is subjective: the result is only as good as the effort and steadiness of the person taking it. A careless or rushed test has no value, and this page will tell you so — fixation and false-response checks are built in, and an unreliable test is labeled unreliable rather than dressed up as a result.
Your report is prepared for the office automatically. When you finish this test — whether you complete it, stop early, or the result is judged unreliable — a report of your attempt is generated automatically for Paddy Kalish OD, so there is documentation of every attempt. There is nothing for you to approve or send, and no yes/no choice to make. You can also download a PDF copy for yourself at the end.

How to take this test properly

Perimetry is a team effort between you and the machine. These rules are not optional — they are what make the result mean anything:

  1. Cover the eye that is not being tested — completely, with your palm, a patch, or a tissue over the closed lid. No peeking. Do not press on the eye.
  2. Stare at the yellow center dot the entire time. Never look toward a flash, not even for an instant. Your side vision is what is being tested.
  3. Respond only when you actually see a flash — tap, click, or press the Space bar. Do not guess. Pressing when nothing appeared is recorded as a false positive and can invalidate the test.
  4. Blink normally and sit still, at the distance you set below, with the screen at eye level. Dim the room lights and turn your screen brightness up.
  5. Wear the glasses you use for the computer or reading, if you have them.
  6. Rest if you tire. A fatigued test is a worthless test — pause, or stop and repeat it later.

You will first do a short guided practice run so the task is familiar before anything is measured. During the test, the machine quietly checks your fixation by flashing lights in your natural blind spot (the Heijl–Krakau method used by real perimeters), and includes blank trials to catch guessing.

What the result shows

  • Reliability indices — fixation losses, false positives, false negatives — the same quality measures printed on a clinical field report, judged against accepted perimetry thresholds.
  • A grayscale field map of the 54 test points, in the layout of a 24-2 printout.
  • Pattern observations — where missed points cluster (arcuate-type, nasal step, hemifield loss and so on), worded as screening observations, never as a diagnosis.

Best on a laptop or desktop screen in a dim room. A phone screen compresses the test field and makes the test cruder — the setup panel tells you the field your screen can actually show.

Set up the test

Optional, but please enter it: your name appears on the report as the person who attempted the test, so the office can file it with the right chart.

Measure roughly from your eyes to the screen and then stay there for the whole test. Moving closer or farther changes what the test measures.

Also set your device screen brightness to maximum. The test uses this level for screening and re-checks anything missed at full brightness.

Drag the slider until the dashed outline is exactly the width of a bank card or driver's licence held against the screen (85.6 mm). This is how the test places flashes at true visual angles.

match this width to your card
Test field: computing…

The practice run takes about 30 seconds and is required before the first real test — perimetry done cold, by someone who has never done the task, measures the learning curve instead of the visual field.

This page is a screening aid prepared for patient education. It is not a medical device and does not diagnose glaucoma or any other condition. A normal screening result does not rule out eye disease, and an abnormal one does not establish it — either way, findings belong in a proper examination with calibrated perimetry. Seek prompt care for any sudden loss of vision, a curtain or shadow across your sight, flashes of light, or a shower of new floaters.

Right eye (OD)
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Paused

Keep your eyes on the yellow dot at all times · respond only when you see a flash — tap, click, or press Space

Visual field screening result

Reliability indices

The same quality measures a clinical perimeter reports. Fixation is monitored by flashes aimed at your natural blind spot (Heijl–Krakau): if you answer those, your eyes were not on the center dot. Blank trials catch guessing; bright re-checks of points you saw catch flagging attention.

Field map — 24-2 pattern, grayscale

Seen at screening brightness

Seen only at full brightness — reduced sensitivity

Not seen even at full brightness

× marks your natural blind spot — a normal finding, not a defect

Dark grey — point never presented; appears only when a test was stopped early

Pattern observations

Screening result only — not a diagnosis, and not a substitute for clinical perimetry or an eye examination. Visual field testing is subjective: fatigue, distraction, a wandering eye, or guessing can all manufacture an abnormal-looking field, which is why the reliability indices above come first. If this screening shows a defect, or if you have any visual symptoms, arrange a proper examination. Seek urgent care for sudden vision loss, a curtain or shadow across your sight, flashes of light, or many new floaters.