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Recommended Standard Procedures for the Clinical Measurement and Specification of Visual Acuity.

ADA220309

Publication Date	1980
Personal Author	Leibowitz, H.
Page Count	24
Abstract	The primary objective of this report is to formulate test conditions, procedures, and criteria which can serve the clinical need associated with routine ophthalmological and optometric measurement of visual acuity. The aim is to enable different examiners to obtain the same test results. The major emphasis is on the standardization of so-called distance acuity for distances approximating optical infinity. Recommendations are also made for tests at a suggested near distance of 40 cm (16 inches). The proposed near tests include (a) measures of acuity with capital letters under conditions comparable to those used to measure distance acuity, and (b) tests of ability to read continuous test. The present approach to the problem is unique in that the Landolt ring has been adopted as the primary standard prototype. Other kinds of optotypes (letters, digits or other characters) may be used, but must yield results that are commensurate with results obtained with Landolt rings. This approach makes possible the establishment of equivalence among the various kinds of prototypes. In addition, the Committee recommends use of metric designations in keeping with current trends, and suggests for consideration the use of four meters as the test distance. Reprints. (KT)
Keywords	Visual acuity Clinical medicine Measurement Measuring instruments Optometry Patterns Prototypes Range(Distance) Reading Test methods Reprints Rings Specifications Test and evaluation Yield
Source Agency	Non Paid Reprints
NTIS Subject Category	57S - Physiology
Corporate Authors	National Research Council, Washington, DC. Assembly of Behavioral and Social Sciences.
Supplemental Notes	Pub. in Advances in Ophthalmology, v41 p103-108 1980.
Document Type	Journal Article
NTIS Issue Number	199015
Contract Number	N00014-79-C-0060

Recommended Standard Procedures for the Clinical Measurement and Specification of Visual Acuity.

Recommended Standard Procedures for the Clinical Measurement and Specification of Visual Acuity.
ADA220309

Publication Date	1980
Personal Author	Leibowitz, H.
Page Count	24
Abstract	The primary objective of this report is to formulate test conditions, procedures, and criteria which can serve the clinical need associated with routine ophthalmological and optometric measurement of visual acuity. The aim is to enable different examiners to obtain the same test results. The major emphasis is on the standardization of so-called distance acuity for distances approximating optical infinity. Recommendations are also made for tests at a suggested near distance of 40 cm (16 inches). The proposed near tests include (a) measures of acuity with capital letters under conditions comparable to those used to measure distance acuity, and (b) tests of ability to read continuous test. The present approach to the problem is unique in that the Landolt ring has been adopted as the primary standard prototype. Other kinds of optotypes (letters, digits or other characters) may be used, but must yield results that are commensurate with results obtained with Landolt rings. This approach makes possible the establishment of equivalence among the various kinds of prototypes. In addition, the Committee recommends use of metric designations in keeping with current trends, and suggests for consideration the use of four meters as the test distance. Reprints. (KT)
Keywords	Visual acuity Clinical medicine Measurement Measuring instruments Optometry Patterns Prototypes Range(Distance) Reading Test methods Reprints Rings Specifications Test and evaluation Yield
Source Agency	Non Paid Reprints
NTIS Subject Category	57S - Physiology
Corporate Authors	National Research Council, Washington, DC. Assembly of Behavioral and Social Sciences.
Supplemental Notes	Pub. in Advances in Ophthalmology, v41 p103-108 1980.
Document Type	Journal Article
NTIS Issue Number	199015
Contract Number	N00014-79-C-0060