BS EN ISO 8598:1998

Optics and optical instruments. Focimeters. | Status: Withdrawn, Superseded

1 Scope 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.

NOTE 1 For the measurement of vertex powers of contact lenses, see ISO 9337:—1), Optics and optical instruments — Contact lenses — Determination of back vertex power.