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ABM Health Care
03323936859
👁️
System Calibrated & Ready
This eye examination system is precisely calibrated so that testing at 10 feet (3 metres) produces results equivalent to the standard 6-metre Snellen chart used in clinical practice.
10 ft
Actual patient
standing distance
6 m
Clinical standard
equivalent distance
6/6
Normal vision
(equiv. 20/20)
6/60
Severely impaired
(equiv. 20/200)

⚙️ Preparation Checklist

1
Position the patient exactly 10 feet (3.05 m) from this screen. Use a tape measure if needed.
2
Screen at eye level, normal ambient lighting, no glare.
3
Test each eye separately — cover one eye at a time with an occluder.
4
Set screen brightness to maximum. Letters are white on black.
5
Record the lowest row read correctly (≥ 50% letters correct). That is the acuity, e.g. 6/12.
📐 Letter Size Calibration — Why 10 ft = 6 m Standard
Printed Chart @ 6 m This Screen @ 10 ft
6/6 letter height 8.73 mm 4.43 mm = 17 px
6/12 letter height 17.5 mm 8.89 mm = 34 px
6/30 letter height 43.7 mm 22.2 mm = 84 px
Visual angle (all rows) 5 arcmin 5 arcmin ✓ identical
Required screen setup Min: 1280×768 · Ideal: 1920×1080 · Windows 100% scaling · Browser 100% zoom · Screen brightness maximum
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Eye Examination System

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10 ft