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Both projection charts and computer displays offer a much wider variety of optotypes than encountered on conventional backlit charts. Using projection charts it is possible to isolate individual lines and letters but they suffer from the disadvantage of a lack of letters, numbers or pictures on an individual line due to the limitation of the projected image area which can lead to memory influencing patient responses. Computer driven charts can offer an almost infinite number of customisable charts and advantageously offer chart types which are not normally encountered including LogMAR and contrast sensitivity charts.
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