Comparison of optical and ultrasound pachometry.
Indian J Ophthalmol
;
2000 Dec; 48(4): 279-83
Artigo
em Inglês
| IMSEAR
| ID: sea-71256
ABSTRACT
PURPOSE:
(1) To determine the agreement between optical and ultrasound pachometry for central corneal thickness measurements used to "correct" applanation intraocular pressure (IOP) readings. (2) To determine the inter- and intra-observer variability of optical and ultrasound pachometry.METHOD:
Central corneal thickness (CCT) was measured in a masked manner using optical and ultrasound pachometry in 50 normal eyes. To assess intra- and inter-observer variability, multiple masked measurements were obtained in 51 eyes (optical pachometry) and 34 eyes (ultrasound pachometry). Agreement was determined by a published technique that uses the mean of the differences, standard error (SE) and standard deviation (SD).RESULTS:
The mean difference in CCT between optical and ultrasound pachometry was 0.001 mm (SD 0.031 mm; SE 0.00439 mm). The mean inter-observer difference for the optical pachometer was 0.019 mm (SD 0.049 mm; SE 0.0069); the mean intra-observer difference was 0.003 mm (SD 0.017; SE 0.0.0024). The mean inter-observer difference for ultrasound pachometry was 0.001 mm (SD 0.009; SE 0.0015) and the mean intra-observer difference was 0.002 mm (SD 0.011; SE 0.0019).CONCLUSIONS:
Ultrasound pachometry is the more reliable method for the measurement of central corneal thickness used to correct applanation IOP values. Optical pachometry had good intra-observer variability. The range of error in IOP correction for corneal thickness (inter-observer) that can occur using the ultrasound pachometer is -1.2 mmHg to +1.4 mmHg as compared to -5.6 mmHg to +8.5 mmHg with the optical pachometer.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Valores de Referência
/
Humanos
/
Variações Dependentes do Observador
/
Glaucoma
/
Hipertensão Ocular
/
Córnea
/
Técnicas de Diagnóstico Oftalmológico
Tipo de estudo:
Ensaio Clínico Controlado
Idioma:
Inglês
Revista:
Indian J Ophthalmol
Ano de publicação:
2000
Tipo de documento:
Artigo
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