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BS EN ISO 8596:2009

Ophthalmic optics. Visual acuity testing. Standard optotype and its presentation (British Standard)

ISO 8596:2009 specifies a range of Landolt ring optotypes and describes a method for measuring distance visual acuity under daylight conditions for the purposes of certification or licensing.

It is neither intended as a standard for clinical measurements nor for the certification of blindness or partial sight.

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