Corneal astigmatism measuring module for slit lamps.
Phys Med Biol
; 51(12): 3085-98, 2006 Jun 21.
Article
em En
| MEDLINE
| ID: mdl-16757864
We have developed an automatic keratometer module for slit lamps that provides automatic measurements of the radii of the corneal curvature. The system projects 72 light spots displayed in a precise circle at the examined cornea. The displacement and deformation of the reflected image of these light spots are analysed providing the keratometry. Measurements in the range of 26.8-75 D can be obtained and a self-calibration system has been specially designed in order to keep the system calibrated. Infrared LEDs indicate automatically which eye is being examined. Volunteer patients (492) have been submitted to the system and the results show that our system has a high correlation factor with the commercially available manual keratometers and the keratometry measurements from a topographer. Our developed system is 95% in agreement with the corneal topographer (Humphrey--Atlas 995 CZM) and the manual keratometer (Topcon OM-4). The system's nominal precision is 0.05 mm for the radii of curvature and 1 degree for the associated axis.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Astigmatismo
/
Iluminação
/
Diagnóstico por Computador
/
Topografia da Córnea
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
Phys Med Biol
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido