ISO 9342-2:2005 PDF

Name: ISO 9342-2:2005 — Optics and optical instruments — Test lenses for calibration of focimeters — Part 2: Test lenses for focimeters used for measuring contact lenses
SKU: ISO 9342-2:2005
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Optics and optical instruments — Test lenses for calibration of focimeters — Part 2: Test lenses for focimeters used for measuring contact lenses

Название (английский):

ISO 9342-2:2005

Optics and optical instruments — Test lenses for calibration of focimeters — Part 2: Test lenses for focimeters used for measuring contact lenses

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 15 ноября 2005 г.
Издание:: ISO IS 9342 edition 1 version 1
ICS:: 11.040.70

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Описание (английский):

ISO 9342-2:2005 specifies requirements for test lenses for focimeters that are used to measure contact lenses. These test lenses are used to find the precise correction values that are needed to convert the power values measured to back vertex power values. ISO 9342-2:2005 applies to focimeters meeting the requirements of ISO 8598.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 9342-2:2005 defines requirements for test lenses used to calibrate focimeters when measuring contact lenses. The standard specifies how test lenses are designed, manufactured and verified so that focimeter measurements (instrument-measured power) can be reliably converted to back vertex power - the conventional “power” of a contact lens expressed in dioptres (D, m‑1). ISO 9342-2 applies to focimeters that meet ISO 8598.

Key topics and technical requirements

Purpose: Test lenses provide precise correction values to convert focimeter readings into back vertex power.

Recommended spherical set: −20 D, −15 D, −10 D, −5 D, +5 D, +10 D, +15 D, +20 D.

Optical material and quality: Preferably precision homogeneous white crown glass free of bubbles/striae within a 4 mm radius of the centre; other materials permitted if durability and reproducibility match the specification.

Geometry and apertures: Spherical test lenses must have a free aperture ≥ 8 mm. Back-surface curvature should approximate common contact lens base curves (7–9 mm); the nominal value is 8 mm with a radius tolerance of ±0.1 mm.

Centre thickness ranges: Design thickness ranges are specified by power class to ensure durability:

Negative powers (−20 to −5 D): 0.5 to 1.5 mm
Positive powers (+5 to +20 D): 1.0 to 2.0 mm

Power tolerances: Stated back vertex power values must lie within ±0.03 m‑1 (±0.03 D) of the declared value.

Reference wavelengths: Measurements may use the green mercury line (546.07 nm) or the yellow helium line (587.56 nm) per ISO 7944.

Manufacture and uncertainty: Annex A outlines production methods, component tolerances (radii, thickness, refractive index, surface fit) and uncertainty analysis. Example: for a +10.0 D lens the combined standard uncertainty u_c ≈ 0.0076 D and expanded uncertainty U (k=3) ≈ 0.023 D.

Applications and users

Calibration laboratories and manufacturers of focimeters and calibration equipment.

Optical metrology labs and quality-control teams in contact lens and ophthalmic optics manufacturing.

Regulatory and standards personnel verifying instrument traceability to international norms.

Eye-care equipment service technicians who perform focimeter calibration and validation.

Related standards

ISO 8598 - Focimeters (instrument requirements to which this part applies)

ISO 7944 - Reference wavelengths (defines the wavelengths used)

ISO 18369‑3 - Contact lenses - measurement methods (related measurement practices)

Practical takeaway: ISO 9342-2 provides a clear specification for the design, tolerances and uncertainty budgeting of focimeter test lenses so that contact-lens power measurements are accurate, reproducible and traceable.

ISO 9342-2:2005 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 9342-2:2006

Optics and optical instruments - Test lenses for calibration of focimeters - Part 2: Test lenses for focimete…

SIST EN ISO 8598-1:2014

Optics and optical instruments - Focimeters - Part 1: General purpose instruments used for measuring spectacl…

SIST EN ISO 7944:2025

Optics and photonics - Reference wavelengths (ISO 7944:2024)

SIST EN ISO 18369-3:2017

Ophthalmic optics - Contact lenses - Part 3: Measurement methods (ISO 18369-3:2017)