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.
Status: WithdrawnPublication date: 2009-07
Edition: 2Number of pages: 5
Technical Committee: ISO/TC 172/SC 7 Ophthalmic optics and instruments