Evaluation of semiautomated measurement of geographic atrophy in age-related macular degeneration by fundus autofluorescence in clinical setting.
OBJECTIVE
To assess intraobserver and interobserver agreement among physicians with different degrees of clinical experience, using a novel fundus autofluorescence semiautomated software for quantification of geographic atrophy in clinical setting.


METHODS
Fundus autofluorescence frames (excitation: 488 nm; emission: 500-700 nm) of 29 eyes (20 patients; mean age, 79.6 ± 6.2 years) with geographic atrophy secondary to age-related macular degeneration, and no signs of choroidal neovascularization, were analyzed using Region Finder, a semiautomated software embedded in Spectralis (Heidelberg Engineering, Heidelberg, Germany). For each study eye, semiautomated atrophy identification and quantification were independently performed, twice (in a 2-week time frame), by 3 readers with different degrees of clinical experience (2 fellows, and 1 resident). Intraobserver and interobserver agreements were assessed.


RESULTS
Mean difference in intraobserver agreement (Bland-Altman statistics) ranged from -0.17 mm² to 0.13 mm². Intraobserver agreement was excellent until the geographic atrophy threshold value of 15.72 mm². Variability correlated with the size of atrophy. Mean difference in interobserver agreement (Bland-Altman statistics) ranged from -0.25 mm² to 0.27 mm², with no significant difference between senior and junior readers. Multifocal lesion or foveal involvement in atrophy was not the cause of disagreement.


CONCLUSIONS
Region Finder is a reliable tool for the identification and quantification of geographic atrophy in patients with age-related macular degeneration, in a clinical setting even when performed by junior reader.
*Department of Ophthalmology, University of Paris XII, Centre Hospitalier Intercommunal de Creteil, Creteil, France; and †Centre de Recherche Clinique, CRC, CHI Creteil, Creteil, France.
Christophe
C
Panthier
Giuseppe
G
Querques
Nathalie
N
Puche
Valérie
V
Le Tien
Rocio B
RB
Garavito
Stephane
S
Béchet
Nathalie
N
Massamba
Eric H
EH
Souied
D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005451:Fluorescein Angiography; D057092:Geographic Atrophy / Q000175:diagnosis*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008268:Macular Degeneration / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D009887:Ophthalmoscopy; D061848:Optical Imaging