Comparison of retinal vessel measurements in digital vs film images.
OBJECTIVE
To compare central retinal artery equivalents (CRAE) and central retinal vein equivalents (CRVE) from vessels measured from images captured with a digital camera and digitized images taken with a film camera.


METHODS
Comparison of techniques.


METHODS



METHODS
Clinic.


METHODS
A total of 75 eyes of 48 adults.


METHODS
Gradings of retinal vessel diameters from images produced by using two photographic techniques: directly from a 45 degrees digital camera and digitized by scanning from a 30 degrees film-based camera.


METHODS
Differences in CRAE and CRVE from two types of images.


RESULTS
CRAE and CRVE were highly comparable between the two techniques with correlation coefficients of 0.88 and 0.87, respectively.


CONCLUSIONS
Estimates of CRAE and CRVE from measurements taken from digitally captured and digitized film-based images were highly comparable. It is likely that inferences about factors associated with retinal vessel diameters will be unbiased by the method of imaging.
Mosher
Anne
A
Department of Ophthalmology and Visual Sciences, University of Wisconsin Medical School Madison, Madison, Wisconsin 53726, USA. mosher@epi.ophth.wisc.edu
Klein
Barbara E K
BE
Klein
Ronald
R
Knudtson
Michael D
MD
Ferrier
Nicola J
NJ
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001837:Body Weights and Measures; D006801:Humans; D008875:Middle Aged; D010781:Photography / Q000379:methods*; D012171:Retinal Vessels / Q000033:anatomy & histology*; D012815:Signal Processing, Computer-Assisted