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Acta Ophthalmol Scand. 2001 Dec;79(6):576-9.

Anterior chamber depth estimation by Scheimpflug photography.

Author information

  • 1Unit of Ophthalmology, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, P.O. Box 7018, SE-750 07 Uppsala, Sweden. jorgen.holmen@kirmed.slu.se

Abstract

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.

PMID:
11782222
[PubMed - indexed for MEDLINE]
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