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Abstract #18459 Published in IGR 3-3
Anterior chamber depth estimation by Scheimpflug photography
Holmén JB; Ekesten B; Lundgren BActa Ophthalmologica Scandinavica 2001; 79: 576-579
PURPOSE: To obtain a model suitable for evaluation of the anterior chamber depth (ACD) maintaining capacity of viscoelastic substances, a critical parameter in cataract surgery. METHODS: ACD was estimated using an anterior segment analysis system (EAS-1000, Nidek Co. Ltd., Japan). Variation was studied as an effect of batch number and eye within batch, storage, globe fixation, globe position, and repeated analyses of Scheimpflug images. RESULTS: Considerable variation in ACD was found between eyes, batches, and as a result of prolonged storage (biological factors). Different intraocular pressures before surgery caused significant alterations in ACD after overfilling with a viscoelastic substance. No significant differences were found when the globe position was altered or when the ACD was re-estimated repeatedly from the same photograph. CONCLUSIONS: Differences due to biological factors are more important than methodological errors caused by the Scheimpflug instrument. To reduce these variations when viscoelastics are evaluated, all measurements should be calculated as a percentage of ACD before surgery, and the anterior chamber should be overfilled with a viscoelastic solution.
Dr J.B. Holmén, Unit of Ophthalmology, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden
Classification:
6.8.1 Anterior segment (Part of: 6 Clinical examination methods > 6.8 Photography)