Posterior chamber phakic IOL sizing. Part I. A new algorithm of sulcus ciliaris diameter assessment using anterior segment optical coherence tomography
ABSTRACT Purpose. To study the effectiveness of a new algorithm in measurement of sulcus ciliaris diameter by the method of anterior segment optical coherence tomography (AS-OCT). Material and methods. Thirty two patients (32 eyes) with high myopia (age range: 19 to 50 years) underwent the c...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Russian |
| Published: |
Publishing house "Ophthalmology"
2013-03-01
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| Series: | Офтальмохирургия |
| Subjects: | |
| Online Access: | http://www.eyepress.ru/article.aspx?12785 |
| Summary: | ABSTRACT
Purpose. To study the effectiveness of a new algorithm in measurement of sulcus ciliaris diameter by the method of anterior segment optical coherence tomography (AS-OCT).
Material and methods. Thirty two patients (32 eyes) with high myopia (age range: 19 to 50 years) underwent the comprehensive examination. Mean spherical equivalent (SE) in the study group averaged -13.12 D (range: -6.25 to -21.50 D). Mean axial length was 27.97±1.94mm (range: 24.26 to 31.64mm). Initially we analyzed in details the anatomy of anterior segment of each eye and measured precisely horizontal sulcus ciliaris diameter by the method of ultrasound bio-microscopy (UBM). After that the same parameter was assessed using the new AS-OCT measurement algorithm. Finally we compared UBM measurement results with the AS-OCT and evaluated intra-session intra- and inter-operator repeatability for the obtained AS-OCT data.
Results. The UBM analysis of the anterior segment anatomy showed a correspondence of the peripheral iris pigment layer edge (IPE) to the lateral border of the sulcus ciliaris and gave proof of possibility of sulcus ciliaris diameter assessment using the AS-OCT. Mean sulcus ciliaris diameter values with UBM and AS-OCT were 12.35±0.47mm (range: 11.39 to 13.25mm) and 12.36±0.52mm (range: 11.40 to 13.35mm) respectively (P>0.05). Intra-session intra- and inter-operator repeatability did not exceed 0.17mm and 0.13mm respectively, while intra-individual coefficients of variation did not exceed 0.49% and 0.33% respectively.
Conclusion. The new AS-OCT algorithm can be effectively used to assess sulcus ciliaris diameter with a high level of precision and repeatability. Application of this algorithm in posterior chamber phakic IOL sizing will be discussed in the next report. |
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| ISSN: | 0235-4160 0235-4160 |