Sánchez BJ, Riverón RY, Ortega DL, Rodríguez SS, Miranda HI, Lantigua MI

Language: Spanish
References: 16
Page: 417-426
PDF size: 316.54 Kb.

ABSTRACT

Objective: To determine the consistency of manual Pentacam configuration in refractive surgery screening.
Methods: Observational and descriptive study performed at "Ramon Pando Ferrer" Cuban Institute of Ophthalmology during 2012. The sample was made up of 104 images of eyes examined by Pentacam equipment, which had met the selection criteria. The analyzed variables were diameter for best fit sphere calculation, anterior elevation, posterior elevation and the classification of corneal ectasias based on anterior and posterior elevations was used in order to group the sample.
Results: In the sample, 45.2% and 54.8% used a diameter lower than 8mm and over 8mm for the calculation of the best fit sphere, respectively. The mean comparison between the two groups was statistically significant. According to the ectasia classification based on anterior and posterior elevations, with the over 8mm diameter, the normal exams doubled in some percentage and the pathological ones decreased by 25%, respectively. There are differences between the means and the standard deviations in evolutional exams performed in the same eye, considering the automatic and the manual configurations.
Conclusions: Manual configuration of Pentacam allows attaining consistency in the refractive surgery screening.

REFERENCES

1. Belin MW, Khachikian SS, Ambrosio R Jr. Tomografía corneal basada en la elevación. Segunda Ed. Panama: Jaypee Highlights Medical Publisher, INC; 2012.

2. Committee on Ophthalmic Procedures Assessment Corneal Panel, Cohen EJ(Chair). Corneal Topography. Ophthalmology. 1999;106(8):1628-38.

3. Binder PS, Lindstrom RL, Stulting RD, Donnenfeld E, Wu H, McDonnell P, et al. Keratoconus and corneal ectasia after LASIK. J Cataract Refract Surg 2005;31(11):2035-8.

4. Wang M, editor. Corneal topography in the wavefront era: a guide for clinical application. Thorofare, NJ: Slack Inc.; 2006. p. 313.

5. Belin MW, Litoff D, Strods SJ, Winn SS, Smith RS. The PAR Technology Corneal Topography System. Refract Corneal Surg. 1992;8(1):8896.

6. Ambrósio R Jr, Belin MW. Imaging of the cornea: topography vs tomography. J Refract Surg. 2010;26(11):847-9.

7. Cairns G, McGhee CN. Orbscan computerized topography: attributes, applications, and limitations. J Cataract Refract Surg. 2005;31(1):205-20.

8. Belin MW, Khachikian SS. An introduction to understanding elevation-based topography: how elevation data are displayeda review. Clin Experiment Ophthalmol. 2009;37(1):1429.

9. Fam HB, Lim KL. Corneal elevation indices in normal and keratoconic eyes. J Cataract Refract Surg. 2006;32(8):1281-7.

10. Khachikian SS, Belin MW. Normal Values for Corneal Elevation Using the Pentacam Eye Scanner. Presented ESCRS Winter Congress, Barcelona, Spain, February 2008.

11. Ambrósio R Jr, Klyce SD, Wilson SE. Corneal topographic and pachymetric screening of keratorefractive patients. J Refract Surg. 2003;19(1):24-9.

12. Ambrósio R Jr, Dawson DG, Salomão M, Guerra FP, Caiado AL, Belin MW. Corneal ectasia after LASIK despite low preoperative risk: tomographic and biomechanical findings in the unoperated, stable, fellow eye. J Refract Surg. 2010;26(11):906-11.

13. Ambrósio R Jr, Nogueira LP, Caldas DL, Fontes BM, Luz A, Cazal JO, et al. Evaluation of corneal shape and biomechanics before LASIK. Int Ophthalmol Clin. 2011;51(2):11-38.

14. Ciolino JB, Belin MW. Changes in the posterior cornea after laser in situ keratomileusis and photorefractive keratectomy. J Cataract Refract Surg. 2006;32(9):142631.

15. Ciolino JB, Khachikian SS, Belin MW. Long-Term Stability of the Posterior Cornea after Laser In situ Keratomileusis, J Cataract Refract Sur. 2007;33(8):1366-70.

16. Rabinowitz YS. Keratoconus. Surv Ophthalmol. 1998;42(4):297319.