advertisement
Abstract #56435 Published in IGR 16-1
Frequency of abnormal retinal nerve fibre layer and ganglion cell layer SDOCT scans in healthy eyes and glaucoma suspects in a prospective longitudinal study
Iverson SM; Feuer WJ; Shi W; Greenfield DS;British Journal of Ophthalmology 2014; 98: 920-925
BACKGROUND/AIMS: To examine the frequency of abnormal retinal nerve fibre layer thickness (RNFLT) and ganglion cell complex (GCC) measurements among healthy and glaucoma suspect and preperimetric glaucoma (GSPPG) eyes in a prospective longitudinal study. METHODS: Normal and GSPPG eyes with ≥18 months follow-up were included. Spectral-domain optical coherence tomography (SDOCT) was performed annually in normal and biannually in GSPPG eyes. One eye was randomly selected for inclusion. RNFLT and GCC parameters with p>5% were classified as 'within normal limits (WNL)' and p<1% were classified as 'outside normal limits (ONL)'. RESULTS: 23 normal and 74 GSPPG eyes were followed for a mean 43.4±9.6 months. During serial follow-up, 100% and 91% of normal eyes had all RNFLT and GCC parameters classified as WNL, respectively. 27 (37%) and 17 (23%) of GSPPG eyes had an ONL classification in at least one RNFLT and GCC parameter, respectively. A high percentage (41%-56%) of RNFLT and GCC measurements classified as ONL were not replicated on subsequent scans. The rates of loss for all parameters were similar (p>0.05) between the groups. CONCLUSIONS: Specificity in this sample of healthy eyes was very high for RNFLT and GCC parameters. Confirmation of suspected SDOCT abnormalities is recommended to differentiate reproducible loss from long-term variability.
Full article
Classification:
6.9.2.2 Posterior (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis > 6.9.2 Optical coherence tomography)
2.13 Retina and retinal nerve fibre layer (Part of: 2 Anatomical structures in glaucoma)
