Open AccessAnterior chamber depth estimation by Scheimpflug photography
Author(s) -
Holmén Jörgen B.,
Ekesten Björn,
Lundgren Björn
Publication year - 2001
Publication title -
acta ophthalmologica scandinavica
Language(s) - English
Resource type - Journals
eISSN - 1600-0420
pISSN - 1395-3907
DOI - 10.1034/j.1600-0420.2001.790606.x
Subject(s) - scheimpflug principle , medicine , ophthalmology , cataract surgery , photography , optics , optometry , surgery , cornea , art , physics , visual arts
. 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 IOPs 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. Conclusion: 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 % of ACD before surgery and the anterior chamber should be overfilled with a viscoelastic solution.