The effect of Rigid Gas Permeable Contact Lens Fitting in Corneal Curvature, central Thickness and Volume

Document Type : Original Article

Authors

1 MSc in optometry, department of optometry, Iran University of Medical Sciences, Tehran, Iran

2 Professor of ophthalmology, Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran

3 Professor of optometry, Department of optometry, Iran University of Medical Sciences, Tehran, Iran

4 Associate Professor of optometry , Department of optometry, Iran University of Medical Sciences, Tehran, Iran

5 PhD of Epidemiology, Department of Epidemiology, Faculty of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran

6 Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, International Campus (TUMS IC), Tehran, Iran

Abstract

Purpose:
Evaluation of the corneal curvature, central thickness and volume three months after fitting the Rigid Gas Permeable (RGP) contact lens in keratoconic eyes.
Methods:
Corneal topography maps of 25 keratoconic eyes with a negative history of using the RGP lens were evaluated by Oculus Pentacam. Corneal curvature in both surfaces of the cornea, central corneal thickness and corneal volume were evaluated before and three months after fitting the aspheric RGP lens.
Results:
Three months after using the contact lens, decrease in central corneal thickness  (-3.43µm, P=0.127), decrease in flattest anterior corneal surface power (-0.43D, P=0.339), decrease in anterior corneal steep power (-1.54D, P=0.358) , decrease in  posterior corneal flat power (-0.1D, P=0.121), an increase in posterior corneal steep power (0.02D, P=0.710) and an increase in corneal volume (0.27 mm3 P=0.331) were not statistically significant.
Conclusion:
Lack of significant changes in corneal topographical parameters three months after using the RGP lens may indicate the non progressive nature of keratoconus in this period. Further studies with longer follow-up periods are suggested to obtain more accurate results.

Keywords

Main Subjects

References

1.Efron N. contact lens-induced changes in corneal topography. Optician 1997; 214(5626): 14-22.
2. Belin MW, Villavicencio OF, Ambrósio RR. Tomographic parameters for the detection of keratoconus: suggestions for screening and treatment parameters. Eye Contact Lens 2014; 40(6): 326-30.
3.Ambrósio R, Klyce SD, Wilson SE. Corneal topographic and pachymetric screening of keratorefractive patients. J Refract Surg 2003; 19(1): 24-9.
4. Maeda N, Klyce SD, Tano Y. Detection and classification of mild irregular astigmatism in patients with good visual acuity. Surv Ophthalmol 1998; 43(1): 53-8.
5. Jonsson M, Behndig A. Pachymetric evaluation prior to laser in situ keratomileusis. J Cataract Refract Surg 2005; 31(4): 701-6.
6.Flanagan GW, Binder PS. Precision of flap measurements for laser in situ keratomileusis in 4428 eyes. J Refract Surg 2003; 19(2): 113-23.
7. Cerviño A, Gonzalez-Meijome JM, Ferrer-Blasco T, Garcia-Resua C, et al. Determination of corneal volume from anterior topography and topographic pachymetry: application to healthy and keratoconic eyes. Ophthalmic Physiol Opt 2009; 29(6): 652-60.
8. Gomes JAP, Tan D, Rapuano CJ, Belin MW, et al. Global consensus on keratoconus and ectatic diseases. Cornea 2015; 34(4): 359-69. 
9. Dutta D, Rao HL, Addepalli UK, Vaddavalli PK. Corneal Thickness in Keratoconus. Ophthalmology 2013; 120(3): 457-63.
10. Gromacki SJ, Barr JT. Central and peripheral corneal thickness in keratoconus and normal patient groups. Optom Vis Sci 1994; 71(7): 437-41.
11. Romero-Jiménez M, Santodomingo-Rubido J, Wolffsohn JS. Keratoconus: a review. Cont Lens Anterior Eye 2010; 33(4): 157-66.
12. Tang M, Shekhar R, Miranda D, Huang D. Characteristics of keratoconus and pellucid marginal degeneration in mean curvature maps. Am J Ophthalmol 2005; 140(6): 993-1001.
13. Vazirani J, Basu S. Keratoconus: current perspectives. Clin Ophthalmol 2013; 7: 2019-30.
14. Sweeney DF. Corneal exhaustion syndrome with long-term wear of contact lenses. Optom Vis Sci 1992; 69(8): 601-8. 
15. Phillips CI. Contact lenses and corneal deformation: cause, correlate or co- incidence? Acta Ophthalmol 1990; 68(6): 661-8. 
16. anaty M, Temel A. Corneal curvature changes in soft and rigid gas permeable contact lens wearers after two years of lens wear. CLAO 1996; 22(3): 186-8.
17. Jinabhai A, Radhakrishnan H, O’Donnell C. Corneal changes after suspending contact lens wear in early pellucid marginal corneal degeneration and moderate keratoconus. Eye Contact Lens 2011; 37(2):99-105.

18. Romero-Jiménez M, Santodomingo-Rubido J, Flores-Rodríguez P, González-Méijome J-M. Short-term corneal changes with gas-permeable contact lens wear in keratoconus subjects: a comparison of two fitting approaches J Optom 2015; 8(1): 48-55. 
19. Jinabhai A, O’Donnell C, Radhakrishnan H. Changes in refraction, ocular aberrations, and corneal structure after suspending rigid gas-permeable contact lens wear in keratoconus. Cornea 2012; 31(5):500-8.
20. Iskeleli G, Oral AY, Celikkol L. Changes in corneal radius and thickness in response to extended wear of rigid gas permeable contact lenses CLAO 1996; 22(2): 133-5.
21. Woods CA, Efron N. Regular replacement of extended wear rigid gas permeable contact lenses. CLAO 1996; 22(3): 172-8.
22. Mannion LS, Tromans C, O’Donnell C. Reduction in corneal volume with severity of keratoconus. Curr Eye Res 2011; 36(6): 522-7.
23. Lam AKC, Wong Y, Cheng S. Corneal volume measures for monitoring contact lens induced corneal swelling: a pilot study. Clin Exp Optom 2011; 94(1): 93-7.

24.  Belin MW, Ambrósio R. Scheimpflug imaging for keratoconus and ectatic disease. Indian J Ophthalmol 2013; 61(8): 401-6.

25.  Read SA, Collins MJ, Iskander DR, Davis BA. Corneal topography with Scheimpflug imaging and videokeratography: comparative study of normal eyes. J Cataract Refract Surg 2009; 35(6): 1072-81.
26. Sideroudi H, Labiris G, Giarmoulakis A, Bougatsou N, et al. Repeatability, reliability and reproducibility of posterior curvature and wavefront aberrations in keratoconic and cross-linked corneas. Clin Exp Optom 2013; 96(6): 547-56. 
27. Bennett ES, Weissman BA. Clinical Contact Lens Practice. Philadelphia: Lippincott Williams & Wilkins; 2005. 
28. Goggin M. Astigmatism Optics, Physiology and Management. In: Herranz RM, Zarzuelo GR, Herráez VJ, editors. Contact Lens Correction of Regular and Irregular Astigmatism. Croatia: Intechopen; 2012: 170-171.
29. Piñero DP, Alió JL, Alesón A, Escaf Vergara M, et al. Corneal volume, pachymetry, and correlation of anterior and posterior corneal shape in subclinical and different stages of clinical keratoconus. J Cataract Refract Surg 2010; 36(5): 814-25.
30. Choo JD, Caroline PJ, Harlin DD, Papas EB, et al. Morphologic changes in cat epithelium following continuous wear of orthokeratology lenses: a pilot study. Cont Lens Anterior Eye 2008; 31(1): 29-37.
31. Lian Y, Shen M, Jiang J, Mao X, et al. Vertical and Horizontal Thickness Profiles of the Corneal Epithelium and Bowman’s Layer after Orthokeratology. Invest Ophthalmol Vis Sci 2012; 54(1): 691-6.
32. Hovding G. Variations in central corneal thickness during the first year of contact lens wear. Acta Ophthalmol 1982; 60(1): 57-69.
33. Ladage PM, Yamamoto K, Ren DH, Li L, Jester JV, et al. Effects of rigid and soft contact lens daily wear on corneal epithelium, tear lactate dehydrogenase, and bacterial binding to exfoliated epithelial cells. Ophthalmology 2001; 108(7): 1279-88.
34. Haque S, Fonn D, Simpson T, Jones L. Epithelial thickness changes from the induction of myopia with CRTH RGP contact lenses. Invest Ophthalmol Vis Sci 2008; 49(8): 3345-50.
35. Alharbi A, Swarbrick HA. The effects of overnight orthokeratology lens wear on corneal thickness. Invest Ophthalmol Vis Sci 2003; 44(6): 2518-23.
36. Tyagi G, Collins MJ, Read SA, Davis BA. Corneal changes following short-term rigid contact lens wear. Cont Lens Anterior Eye 2012; 35(3): 129-36.

37. Ambrósio R, Alonso RS, Luz A, Coca Velarde LG. Corneal-thickness spatial profile and corneal-volume distribution: tomographic indices to detect keratoconus. J Cataract Refract Surg 2006; 32(11): 1851-9.
38. Emre S, Doganay S, Yologlu S. Evaluation of anterior segment parameters in keratoconic eyes measured with the Pentacam system. J Cataract Refract Surg 2007; 33(10): 1708-12.

39. Del Aguila-Carrasco AJ, Dominguez-Vicent A, Pérez-Vives C, Ferrer-Blasco T, et al. Assessment of modifications in thickness, curvatures, and volume upon the cornea caused by disposable soft contact lens wear. Eur J Ophthalmol 2015.
 
Journal of Paramedical Sciences & Rehabilitation
Volume 4, Issue 3 - Serial Number 3
September 2015
Pages 17-24

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