Historical
ISO 8596:2009
Ophthalmic optics - Visual acuity testing - Standard optotype and its presentation
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.
CONTENT PROVIDER
International Organization for Standardization [iso]
International Organization for Standardization [iso]