ISO 9338-1996 PDF
Name in English:
St ISO 9338-1996
Name in Russian:
Ст ISO 9338-1996
Original standard ISO 9338-1996 in PDF full version. Additional info + preview on request
Full title and description
ISO 9338:1996 — Optics and optical instruments — Contact lenses — Determination of the diameters. This International Standard specifies methods for determining the diameters of contact lenses and includes normative and informative annexes describing practical measurement procedures for both soft and rigid lenses.
Abstract
ISO 9338:1996 defines measurement methods for contact‑lens diameters, describing sample preparation, measurement techniques and reporting of results. Annex A provides a projection method suitable for soft and rigid contact lenses; Annex B is informational. The standard was intended to give a repeatable laboratory procedure for manufacturers and test laboratories.
General information
- Status: Withdrawn / superseded.
- Publication date: October 1996 (1996-10).
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 11.040.70 (Ophthalmic equipment / Ophthalmic optics and instruments).
- Edition / version: Edition 1 (1996).
- Number of pages: 8 pages.
Scope
ISO 9338:1996 describes standardized laboratory methods for determining the overall diameter of contact lenses. The scope covers practical measurement techniques (including a projection method described in Annex A), instrumentation considerations and procedures for reporting measured diameters so that results are repeatable between laboratories and manufacturers. The standard applies to both soft and rigid contact lenses.
Key topics and requirements
- Definitions and terminology related to contact‑lens diameter measurement.
- Specified measurement procedures (including a projection method in Annex A).
- Recommendations for sample handling, equilibration and positioning during measurement.
- Guidance on instrumentation, measurement accuracy and result reporting.
- Annexes: Annex A (normative) — projection method; Annex B (informative) — examples and notes.
Typical use and users
Primary users included contact‑lens manufacturers, quality and testing laboratories, conformity assessment bodies and regulatory authorities assessing product specifications. The methods were used to ensure consistent diameter measurement for production control, product specifications and regulatory submissions. After withdrawal, users are referred to the successor measurement methods in the ISO 18369 series.
Related standards
ISO 9338:1996 has been withdrawn and its measurement content was incorporated into the ISO 18369 series — specifically ISO 18369‑3 (Measurement methods). ISO 18369‑3:2006 replaced several earlier lens measurement standards (including ISO 9338:1996) and was later revised by ISO 18369‑3:2017 (current consolidated measurement methods for contact lenses). Other related ophthalmic standards (thickness, curvature, transmissivity, oxygen permeability) form the broader set of contact‑lens test methods.
Keywords
contact lenses; diameter; measurement; projection method; ophthalmic optics; ISO 9338; lens testing.
FAQ
Q: What is this standard?
A: ISO 9338:1996 is an International Standard that specified laboratory methods for determining the overall diameter of contact lenses. It provided procedures and annexed measurement techniques for both soft and rigid lenses.
Q: What does it cover?
A: It covers definitions, recommended measurement procedures (including a projection method in Annex A), handling/positioning of lenses for measurement, instrumentation considerations and reporting of results to support repeatability between laboratories.
Q: Who typically uses it?
A: Manufacturers, test laboratories, conformity assessors and regulatory bodies involved in contact‑lens specification and quality control historically used the standard.
Q: Is it current or superseded?
A: ISO 9338:1996 has been withdrawn. Its measurement content was superseded by ISO 18369‑3 (first issued in 2006) and consolidated in ISO 18369‑3:2017, which is the current part of the ISO 18369 series covering measurement methods for contact lenses. Users should apply the ISO 18369‑3 edition currently in force.
Q: Is it part of a series?
A: Yes — the content has been folded into the ISO 18369 series (Ophthalmic optics — Contact lenses). ISO 18369 is a multipart series addressing physical and optical properties, measurement methods and other contact‑lens requirements.
Q: What are the key keywords?
A: Contact lenses; diameter; measurement methods; projection method; ophthalmic optics; ISO 9338; ISO 18369.