Prospective evaluation of visual acuity assessment: a comparison of snellen versus ETDRS charts in clinical practice (An AOS Thesis)
first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a "real world" retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts...
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| description | first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a "real world" retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts starting at 4 or 2 meters.
Prospective, consecutive evaluation of patients who underwent best-corrected visual acuity testing of their right eye performed at a single seating by the same experienced, certified vision examiner in the same room with standardized low light conditions using a projected Snellen chart at 20 feet, and two different back-illuminated ETDRS charts placed 4 and 2 meters from the patient.
One hundred sixty-three eyes were included in the study. The mean Snellen VA was 0.67 logMAR (20/94), ETDRS VA at 4 meters was 0.54 logMAR (~20/69), and ETDRS VA at 2 meters was 0.51 logMAR (~20/65). The mean difference was 6.5 letters better on the ETDRS chart (P=.000000001). As the VA worsened, there was increased variability between the charts and the mean discrepancy between charts also increased. Subgroup analysis revealed the greatest difference between charts was in the poor vision subgroup ( |
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Prospective, consecutive evaluation of patients who underwent best-corrected visual acuity testing of their right eye performed at a single seating by the same experienced, certified vision examiner in the same room with standardized low light conditions using a projected Snellen chart at 20 feet, and two different back-illuminated ETDRS charts placed 4 and 2 meters from the patient.
One hundred sixty-three eyes were included in the study. The mean Snellen VA was 0.67 logMAR (20/94), ETDRS VA at 4 meters was 0.54 logMAR (~20/69), and ETDRS VA at 2 meters was 0.51 logMAR (~20/65). The mean difference was 6.5 letters better on the ETDRS chart (P=.000000001). As the VA worsened, there was increased variability between the charts and the mean discrepancy between charts also increased. Subgroup analysis revealed the greatest difference between charts was in the poor vision subgroup (<20/200) with a difference of 0.2 logMAR (10 letters; P=.0000002). Patients with exudative age-related macular degeneration (AMD) had the greatest disparity on vision testing, but patients with dry AMD and diabetic retinopathy also exhibited significant differences.
Visual acuity scores were significantly better on ETDRS charts compared to Snellen charts. The difference was greatest with poor visual acuity (<20/200) and in patients with exudative AMD. Thus, caution should be exercised when comparing data using the different charts.</description><identifier>ISSN: 0065-9533</identifier><identifier>EISSN: 1545-6110</identifier><identifier>PMID: 20126505</identifier><language>eng</language><publisher>United States: The American Ophthalmological Society</publisher><subject>Adolescent ; Adult ; Aged ; Aged, 80 and over ; Aging ; Diabetic Retinopathy - physiopathology ; Exudates and Transudates ; Female ; Humans ; Macular Degeneration - classification ; Macular Degeneration - physiopathology ; Male ; Middle Aged ; Prospective Studies ; Vision Tests - instrumentation ; Vision Tests - standards ; Visual Acuity ; Young Adult</subject><ispartof>Transactions of the American Ophthalmological Society, 2009-12, Vol.107, p.311-324</ispartof><rights>American Ophthalmological Society 2009</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2814576/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2814576/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,727,780,784,885,53791,53793</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/20126505$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kaiser, Peter K</creatorcontrib><title>Prospective evaluation of visual acuity assessment: a comparison of snellen versus ETDRS charts in clinical practice (An AOS Thesis)</title><title>Transactions of the American Ophthalmological Society</title><addtitle>Trans Am Ophthalmol Soc</addtitle><description>first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a "real world" retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts starting at 4 or 2 meters.
Prospective, consecutive evaluation of patients who underwent best-corrected visual acuity testing of their right eye performed at a single seating by the same experienced, certified vision examiner in the same room with standardized low light conditions using a projected Snellen chart at 20 feet, and two different back-illuminated ETDRS charts placed 4 and 2 meters from the patient.
One hundred sixty-three eyes were included in the study. The mean Snellen VA was 0.67 logMAR (20/94), ETDRS VA at 4 meters was 0.54 logMAR (~20/69), and ETDRS VA at 2 meters was 0.51 logMAR (~20/65). The mean difference was 6.5 letters better on the ETDRS chart (P=.000000001). As the VA worsened, there was increased variability between the charts and the mean discrepancy between charts also increased. Subgroup analysis revealed the greatest difference between charts was in the poor vision subgroup (<20/200) with a difference of 0.2 logMAR (10 letters; P=.0000002). Patients with exudative age-related macular degeneration (AMD) had the greatest disparity on vision testing, but patients with dry AMD and diabetic retinopathy also exhibited significant differences.
Visual acuity scores were significantly better on ETDRS charts compared to Snellen charts. The difference was greatest with poor visual acuity (<20/200) and in patients with exudative AMD. Thus, caution should be exercised when comparing data using the different charts.</description><subject>Adolescent</subject><subject>Adult</subject><subject>Aged</subject><subject>Aged, 80 and over</subject><subject>Aging</subject><subject>Diabetic Retinopathy - physiopathology</subject><subject>Exudates and Transudates</subject><subject>Female</subject><subject>Humans</subject><subject>Macular Degeneration - classification</subject><subject>Macular Degeneration - physiopathology</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Prospective Studies</subject><subject>Vision Tests - instrumentation</subject><subject>Vision Tests - standards</subject><subject>Visual Acuity</subject><subject>Young Adult</subject><issn>0065-9533</issn><issn>1545-6110</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpVkEtLw0AUhYMoWh9_QWanLgIzmc5k6kIotT6goGhdh9vJjR1JJnFuEujeH26gVXR1F-fwfZy7F42EGqtYC8H3oxHnWsUTJeVRdEz0wblMpdCH0VHCRaIVV6Po6znU1KBtXY8Meyg7aF3tWV2w3lEHJQPbuXbDgAiJKvTtNQNm66qB4GjbJI9liZ71GKgjNl_evrwyu4bQEnOe2dJ5ZwdUE2AQWWSXU8-mT69suUZydHUaHRRQEp7t7kn0djdfzh7ixdP942y6iBtheBsbhSrnyqQrSHi-Ag6aG7Oa5AVqSLkt7FinOjdQaDnJcZibF6lFI4QynHOUJ9HNltt0qwpzO4wJUGZNcBWETVaDy_4n3q2z97rPEiPGKtUD4GIHCPVnh9RmlSM7jAePdUdZKuVEpUqPh-b5X9Wv4-fz8hvfIoOs</recordid><startdate>20091201</startdate><enddate>20091201</enddate><creator>Kaiser, Peter K</creator><general>The American Ophthalmological Society</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20091201</creationdate><title>Prospective evaluation of visual acuity assessment: a comparison of snellen versus ETDRS charts in clinical practice (An AOS Thesis)</title><author>Kaiser, Peter K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p180t-85e5d0587ba20dba0a6088b9dfe6a70cfc4676d8af639de003df7ce81158000e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Adolescent</topic><topic>Adult</topic><topic>Aged</topic><topic>Aged, 80 and over</topic><topic>Aging</topic><topic>Diabetic Retinopathy - physiopathology</topic><topic>Exudates and Transudates</topic><topic>Female</topic><topic>Humans</topic><topic>Macular Degeneration - classification</topic><topic>Macular Degeneration - physiopathology</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Prospective Studies</topic><topic>Vision Tests - instrumentation</topic><topic>Vision Tests - standards</topic><topic>Visual Acuity</topic><topic>Young Adult</topic><toplevel>online_resources</toplevel><creatorcontrib>Kaiser, Peter K</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Transactions of the American Ophthalmological Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kaiser, Peter K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Prospective evaluation of visual acuity assessment: a comparison of snellen versus ETDRS charts in clinical practice (An AOS Thesis)</atitle><jtitle>Transactions of the American Ophthalmological Society</jtitle><addtitle>Trans Am Ophthalmol Soc</addtitle><date>2009-12-01</date><risdate>2009</risdate><volume>107</volume><spage>311</spage><epage>324</epage><pages>311-324</pages><issn>0065-9533</issn><eissn>1545-6110</eissn><abstract>first, to prospectively compare visual acuity (VA) scores obtained with Snellen charts versus Early Treatment Diabetic Retinopathy Study (ETDRS) charts in a "real world" retinal practice, and second, to see if there was a difference in visual acuity measurements obtained with ETDRS charts starting at 4 or 2 meters.
Prospective, consecutive evaluation of patients who underwent best-corrected visual acuity testing of their right eye performed at a single seating by the same experienced, certified vision examiner in the same room with standardized low light conditions using a projected Snellen chart at 20 feet, and two different back-illuminated ETDRS charts placed 4 and 2 meters from the patient.
One hundred sixty-three eyes were included in the study. The mean Snellen VA was 0.67 logMAR (20/94), ETDRS VA at 4 meters was 0.54 logMAR (~20/69), and ETDRS VA at 2 meters was 0.51 logMAR (~20/65). The mean difference was 6.5 letters better on the ETDRS chart (P=.000000001). As the VA worsened, there was increased variability between the charts and the mean discrepancy between charts also increased. Subgroup analysis revealed the greatest difference between charts was in the poor vision subgroup (<20/200) with a difference of 0.2 logMAR (10 letters; P=.0000002). Patients with exudative age-related macular degeneration (AMD) had the greatest disparity on vision testing, but patients with dry AMD and diabetic retinopathy also exhibited significant differences.
Visual acuity scores were significantly better on ETDRS charts compared to Snellen charts. The difference was greatest with poor visual acuity (<20/200) and in patients with exudative AMD. Thus, caution should be exercised when comparing data using the different charts.</abstract><cop>United States</cop><pub>The American Ophthalmological Society</pub><pmid>20126505</pmid><tpages>14</tpages></addata></record> |
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| source | MEDLINE; EZB-FREE-00999 freely available EZB journals; PubMed Central |
| subjects | Adolescent Adult Aged Aged, 80 and over Aging Diabetic Retinopathy - physiopathology Exudates and Transudates Female Humans Macular Degeneration - classification Macular Degeneration - physiopathology Male Middle Aged Prospective Studies Vision Tests - instrumentation Vision Tests - standards Visual Acuity Young Adult |
| title | Prospective evaluation of visual acuity assessment: a comparison of snellen versus ETDRS charts in clinical practice (An AOS Thesis) |
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