DS DS/EN ISO 8598
DS DSEN SO 8598 1998-AUG-24 Optcs and optcal nstruments - Focmeters
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This International Standard specifies requirements for continuously indicating focimeters and digitally rounding focimeters with which the vertex powers and prismatic powers of spherical and astigmatic lenses, including lenses mounted in frames and contact lenses, can be measured and with which lenses can be orientated and marked.