Reliability of retinal vessel calibre measurements using a retinal oximeter.
BMC Ophthalmol
; 15: 184, 2015 Dec 24.
Article
em En
| MEDLINE
| ID: mdl-26705024
ABSTRACT
BACKGROUND:
Summarised retinal vessel diameters are linked to systemic vascular pathology. Monochromatic images provide best contrast to measure vessel calibres. However, when obtaining images with a dual wavelength oximeter the red-free image can be extracted as the green channel information only which in turn will reduce the number of photographs taken at a given time. This will reduce patient exposure to the camera flash and could provide sufficient quality images to reliably measure vessel calibres.METHODS:
We obtained retinal images of one eye of 45 healthy participants. Central retinal arteriolar and central retinal venular equivalents (CRAE and CRVE, respectively) were measured using semi-automated software from two monochromatic images one taken with a red-free filter and one extracted from the green channel of a dual wavelength oximetry image.RESULTS:
Participants were aged between 21 and 62 years, all were normotensive (SBP 115 (12) mmHg; DBP 72 (10) mmHg) and had normal intra-ocular pressures (12 (3) mmHg). Bland-Altman analysis revealed good agreement of CRAE and CRVE as obtained from both images (mean bias CRAE = 0.88; CRVE = 2.82).CONCLUSIONS:
Summarised retinal vessel calibre measurements obtained from oximetry images are in good agreement to those obtained using red-free photographs.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Artéria Retiniana
/
Veia Retiniana
/
Oximetria
Limite:
Adult
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
BMC Ophthalmol
Assunto da revista:
OFTALMOLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Reino Unido