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Titolo:
MEASUREMENT ERROR IN ASSESSING THE SIZE OF CORTICAL CATARACTS FROM RETROILLUMINATION PHOTOGRAPHS
Autore:
DATILES MB; LASA MS; PODGOR MJ; HERNANDEZGALILEA E; MAGNO BV;
Indirizzi:
NEI,9000 ROCKVILLE PIKE,BLDG 10,ROOM 10N226 BETHESDA MD 20982 NEI BETHESDA MD 20892
Titolo Testata:
Current eye research
fascicolo: 1, volume: 14, anno: 1995,
pagine: 19 - 26
SICI:
0271-3683(1995)14:1<19:MEIATS>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSTERIOR SUBCAPSULAR CATARACTS; LENS OPACITIES; ANALYSIS SYSTEM; CLASSIFICATION; NUCLEAR;
Keywords:
CORTICAL CATARACTS; RETROILLUMINATION PHOTOGRAPHS; MEASUREMENT ERROR; COMPUTER PLANIMETRY; SAMPLE SIZE ESTIMATES; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
M.B. Datiles et al., "MEASUREMENT ERROR IN ASSESSING THE SIZE OF CORTICAL CATARACTS FROM RETROILLUMINATION PHOTOGRAPHS", Current eye research, 14(1), 1995, pp. 19-26

Abstract

This study describes a new method of quantifying anteriorly located cortical cataracts using retroillumination photographs and computer planimetry. Cortical cataracts were graded clinically and then photographed using the Neitz retroillumination camera twice by each of 2 photographers. The cataract outlines were traced onto a transparent overlay, and computer planimetry was performed using a Scan Maker 600ZS, a MAC II Computer and specially developed software. We estimated the measurement error of the method and its associated effect on sample size estimates for clinical studies. We calculated that the variability in thistechnique would contribute about 21 additional subjects to overall sample size estimates in studies comparing the mean areas of cortical opacities. In many studies this would be a small addition to total sample size requirements. This technique provides clinically useful measurements of the size of a cortical opacity as seen on a retroilluminationphotograph. This may be useful for future clinical studies on naturalprogression of cortical cataracts as well as for clinical trials of anticataract drugs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 19:25:24