Uses British standards lettering. Calibrated for use at 3m. Can be portable, made of strong plastic. Measures about 24 x 11.5cm and weighs about 50g. The scoring is still 6/x where the x is the number below the smallest line of letters correctly read. If the patient reads bottom line “5” at 3m the VA is 6/5. Designed and produced by registered optometrist. The following lines when tested at 3m: 6/60, 6/36, 6/24, 6/18, 6/12, 6/9, 6/7.5, 6/6, 6/5. In theory this item could be made for other custom testing distances too. A piece of string or the included treasury tag could be used to hang the chart
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