Measuring contrast sensitivity with inappropriate optical correction
Spatial frequency-selective minima (notches) in the contrast sensitivity function (CSF) because of defocus can mimic those that occur with ocular disease. We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of de...
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Veröffentlicht in: | Ophthalmic & physiological optics 2000-11, Vol.20 (6), p.442-451 |
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creator | Woods, Russell L. Strang, Niall C. Atchison, David A. |
description | Spatial frequency-selective minima (notches) in the contrast sensitivity function (CSF) because of defocus can mimic those that occur with ocular disease. We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of defocus for all subjects. Multiple notches were found under some conditions. Notches were found with defocus as small as 0.50D. Effects of induced astigmatism depended on the orientation of the target. Notches were apparent in defocus conditions after stimulus size and room illuminance were modified and when subjects had insufficient accommodation to compensate for hypermetropic defocus. The equivalent of notches was not noted with the Pelli–Robson chart. As defocus-induced CSF notches may be mistaken for functional loss, careful refractive correction should be conducted prior to clinical or experimental CSF measurement, even at low spatial frequencies. |
doi_str_mv | 10.1016/S0275-5408(99)00089-7 |
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We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of defocus for all subjects. Multiple notches were found under some conditions. Notches were found with defocus as small as 0.50D. Effects of induced astigmatism depended on the orientation of the target. Notches were apparent in defocus conditions after stimulus size and room illuminance were modified and when subjects had insufficient accommodation to compensate for hypermetropic defocus. The equivalent of notches was not noted with the Pelli–Robson chart. 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We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of defocus for all subjects. Multiple notches were found under some conditions. Notches were found with defocus as small as 0.50D. Effects of induced astigmatism depended on the orientation of the target. Notches were apparent in defocus conditions after stimulus size and room illuminance were modified and when subjects had insufficient accommodation to compensate for hypermetropic defocus. The equivalent of notches was not noted with the Pelli–Robson chart. As defocus-induced CSF notches may be mistaken for functional loss, careful refractive correction should be conducted prior to clinical or experimental CSF measurement, even at low spatial frequencies.</description><subject>Adult</subject><subject>Aged</subject><subject>Biological and medical sciences</subject><subject>Contrast Sensitivity - physiology</subject><subject>Humans</subject><subject>Investigative techniques of ocular function and vision</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Medical sciences</subject><subject>Middle Aged</subject><subject>Optics and Photonics</subject><subject>Vision Disorders - diagnosis</subject><subject>Vision Disorders - prevention & control</subject><subject>Visual Acuity - physiology</subject><issn>0275-5408</issn><issn>1475-1313</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkN9LwzAQx4Mobk7_BKUgiD5Uc23aNE8i8ydMfFCfQ5peNbK1M0kn--_NtjIffTo4Pnf3vQ8hx0AvgUJ-9UoTnsUZo8W5EBeU0kLEfIcMgYU2pJDukuEWGZAD574CxDkv9skAABIOCRuS22dUrrOm-Yh023irnI8cNs54szB-Gf0Y_xmZRs3ntp1bozxG7dwbraaBtxa1N21zSPZqNXV41NcReb-_exs_xpOXh6fxzSTWacp9DInK8ppVhVB1-KFOqlzRqhS5QsyEQo01y6tCVynkRcnyuhQayoyhSjkA0-mInG32hjDfHTovZ8ZpnE5Vg23nJE-YgISyAGYbUNvWOYu1DNlnyi4lULnSJ9f65MqNFEKu9Uke5k76A105w-pvqvcVgNMeUC44qK1qtHFbrqBJCiJQ1xsKg4yFQSudNthorMzKmKxa80-QX2QPjaA</recordid><startdate>20001101</startdate><enddate>20001101</enddate><creator>Woods, Russell L.</creator><creator>Strang, Niall C.</creator><creator>Atchison, David A.</creator><general>Elsevier Ltd</general><general>Blackwell</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20001101</creationdate><title>Measuring contrast sensitivity with inappropriate optical correction</title><author>Woods, Russell L. ; Strang, Niall C. ; Atchison, David A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c337t-12a56f4d89af101f2d6a0db96aee59aecef46d8cd3168b46fb9c1b54ea37114c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Adult</topic><topic>Aged</topic><topic>Biological and medical sciences</topic><topic>Contrast Sensitivity - physiology</topic><topic>Humans</topic><topic>Investigative techniques of ocular function and vision</topic><topic>Investigative techniques, diagnostic techniques (general aspects)</topic><topic>Medical sciences</topic><topic>Middle Aged</topic><topic>Optics and Photonics</topic><topic>Vision Disorders - diagnosis</topic><topic>Vision Disorders - prevention & control</topic><topic>Visual Acuity - physiology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Woods, Russell L.</creatorcontrib><creatorcontrib>Strang, Niall C.</creatorcontrib><creatorcontrib>Atchison, David A.</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Ophthalmic & physiological optics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Woods, Russell L.</au><au>Strang, Niall C.</au><au>Atchison, David A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Measuring contrast sensitivity with inappropriate optical correction</atitle><jtitle>Ophthalmic & physiological optics</jtitle><addtitle>Ophthalmic Physiol Opt</addtitle><date>2000-11-01</date><risdate>2000</risdate><volume>20</volume><issue>6</issue><spage>442</spage><epage>451</epage><pages>442-451</pages><issn>0275-5408</issn><eissn>1475-1313</eissn><coden>OPOPD5</coden><abstract>Spatial frequency-selective minima (notches) in the contrast sensitivity function (CSF) because of defocus can mimic those that occur with ocular disease. We examined the influence of measurement conditions on CSF shape in simulated clinical testing. CSF notches occurred with almost all levels of defocus for all subjects. Multiple notches were found under some conditions. Notches were found with defocus as small as 0.50D. Effects of induced astigmatism depended on the orientation of the target. Notches were apparent in defocus conditions after stimulus size and room illuminance were modified and when subjects had insufficient accommodation to compensate for hypermetropic defocus. The equivalent of notches was not noted with the Pelli–Robson chart. As defocus-induced CSF notches may be mistaken for functional loss, careful refractive correction should be conducted prior to clinical or experimental CSF measurement, even at low spatial frequencies.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><pmid>11127124</pmid><doi>10.1016/S0275-5408(99)00089-7</doi><tpages>10</tpages></addata></record> |
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subjects | Adult Aged Biological and medical sciences Contrast Sensitivity - physiology Humans Investigative techniques of ocular function and vision Investigative techniques, diagnostic techniques (general aspects) Medical sciences Middle Aged Optics and Photonics Vision Disorders - diagnosis Vision Disorders - prevention & control Visual Acuity - physiology |
title | Measuring contrast sensitivity with inappropriate optical correction |
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