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  Zanco J Med Sci:  Apr. 2018; 22 (1): 49-55

The relation between central corneal thickness, axial length and myopia among a sample of patients in Erbil

Kurdo Mohammedamin Omer *, Ahmed Kareem Joma **

 

* Erbil Directorate of Health, Erbil, Iraq.

** Department of Surgery, College of Medicine, Hawler Medical University, Erbil, Iraq.
 


Abstract

Background and objective: Myopiais a common refractive error in the estimation of corneal barrier and well-beingof endothelial function, the central corneal thickness is important to manage corneal diseases. This study aimed to explore the relationship between central corneal thickness, axial length and myopia among a sample of patients in Erbil.

Methods: This cross-sectional study was conducted from June 2015 to February 2016. Forty six emmetropes as a control group and 46 myopes were studied. Axial length was measured with A-scan ultrasound biometry and central corneal thickness with corneal topography. Central corneal thickness was correlated with myopia and axial length using the Pearson’s correlation coefficient.

Results: This study included 92 patients. The mean age of myopes was 31.87 years and 33 years for emmetropes. Myopia ranged from –0.5 to –11 diopters. The mean central corneal thickness was 541.80 micrometers for myopes and 548.93 micrometersfor emmetropes. The mean axial length was 25.77 millimetersfor myopes and 24.37 millimetersfor emmetropes.The Pearson’s correlation coefficient (r) of the central corneal thickness and myopia was -0.0245 (P =0.872), while that of the central corneal thickness and axial length in myopes was 0.035 (P = 0.566) and of the central corneal thickness and axial length in emmetropes was 0.26 (P = 0.091).

Conclusion: There was no correlation between central corneal thickness, axial length and myopia.

Keywords: Myopia; Central corneal thickness; Axial length.

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Reference

1. Al-Mezaine HS, Al-Obeidan S, Kangave DSadaawy A, Wehaib TAAl-Amro SA. The relationship between central corneal thickness and degree of myopia among Saudi adults. J Int Ophthalmol 2009; 29(5):373-8.

2. Kanski JJ, Browling B, Nischal K, Pearson A. Clinical ophthalmology: A systematic approach. 7thed. Edinburgh: Elsevier Saunders; 2011. P.812.

3. Snell RS, Lemp MA. Clinical anatomy of the eye.2nded. USA: Blackwell Science; 1998. P.204.

4. Zorab RA, Straus H, Arturo C, Tanaka S, Ray J, Veen B, et al. Basic and Clinical Science Course. Clinical optics section 3. San Francisco, USA: American academy of ophthalmology; 2011. p.118.

5. Elias A,Giridhar A, Mahhesh G, Bhat S, Kumar R. Central corneal thickness and relating factors. KJ Ophthalmol 2009; 56(2):149-53.

6. Mishima S. Corneal thickness. Surv Ophthalmol 1968; 13:57-96.

7. Kunert KS, Bhartiya P, Tandon R, Dada T, Christian H, Vajpayee RB. Central corneal thickness in Indian patients undergoing LASIK for myopia. J Refract Surg 2003; 19:378-9.

8. Von-Bahr G. Corneal thickness: its measurement and changes. Am J Ophthalmol 1956; 42:251- 66.

9.Chang SW, Tsai IL, Hu FR, Lin LK, Shih FY. The cornea in young myopic adults. Br J Ophthalmol 2001; 85:916.

10. Chang SW, Tsai IL, Hu FR, Lin LL, Shih YF. The cornea in young myopic adults. Br J Ophthalmol 2001; 85:961-70.

11. Srivannaboon S. Relationship between corneal thickness and level of myopia. J Med Assoc Thai 2002; 85:162-6.

12. European Glaucoma Prevention Study Group, Pfeiffer N, Torri V, Miglior S, Zeyen T, Adamsons I, Cunha-Vaz J. Central corneal thickness in the European Glaucoma Prevention Study. Ophthalmology 2007; 114: 454-9.

13. Chen YC, Kasuga T, Lee HJ, Lee SH, Lin SY. Correlation between central corneal thickness and myopia in Taiwan. Kaohsiung J Med Sci 2014; 30: 20-4.

14. Garcia-Medina M, Garcia-Medina JJ, Garrido-Fernandez P, Galvan-Espinosa J, Martin-Molina J, Garcia-maturana C, et al. Central corneal thickness,intraocular pressure and degree of myopia in an adult myopic population aged 20 to 40 years in southeast Spain:determination and relationships. Clin Ophthalmol 2011; 5:249-58.

15.Tanaka HM, Mori ES, Maia N, Freitas D, Campos M, Chamon W. Corneal thickness in high myopes. Invest Ophthalmol Vis Sci 1996; 37:2566.

16. Price FW, Koller DL, Price MO. Central corneal pachymetry in patients undergoing laser in situ keratomileusis. Ophthalmology 1999; 106:2216-20.

17. Cho P, Lam C. Factors affecting the central corneal thickness of Hong Kong Chinese. Curr Eye Res 1999; 18:368-74.

18. Liu Z, Pflugfelder SC. The effects of long-term contact lens wear on corneal thickness, curvature, and surface regularity. Ophthalmology 2000; 107:105-11.

19. Aghaian E, Choe JE, Lin S, Stamper RL. Central corneal thickness of Caucasians, Chinese, Hispanics, Filipinos, African Americans, and Japanese in a glaucoma clinic. Ophthalmology 2004; 111:2211-9.

20. Oliveira C, Tello C, Liebmann J, Ritch R. Central corneal thickness is not related to anterior scleral thickness or axial length. J Glaucoma 2006; 15:190–4.

21. Fam HB, How AC, Baskaran M, Lim KL, Chan YH, Aung T. Central corneal thickness and its relationship to myopia in Chinese adults. Br J Ophthalmol 2006; 90:1451-3.

22. Pfeiffer N, Torri V, Miglior S, Zeyen T, Adamsons I, Cunha-Vaz J. The European Glaucoma Prevention Study Group. Central corneal thickness in the European Glaucoma Prevention Study. Ophthalmology 2009; 114:454-9.

23. Lin LL, Shih YF, Tsai CB, Chen CJ, Lee LA, Hung PT,et al. Epidemiologic study of ocular refraction among schoolchildren in Taiwan in 1995. Optom Vis Sci 1999; 76:275-81.

24. Funata M, Tokoro T. Scleral change in experimentallymyopic monkeys. Graefes Arch Clin Exp Ophthalmol 1990; 228:174-9.

25. Phillips JR, McBrien NA. Form deprivation myopia: elastic properties of sclera. Ophthalmic Physiol Opt 1995; 15:357-62.

26. Celorio JM, Pruett RC. Prevalence of lattice degeneration and its relation to axial length in severe myopia. Am J Ophthalmol 1991; 111:20-3.

27. Lam CS, Edward M, Millodot M, Goh WS. A 2-year longitudinal study of myopia progression and optical component changes among Hong Kong schoolchildren. Optom Vis Sci 1999; 76:370-80.

28. Curtin BJ. Ocular findings and complications. In: The myopias: basic science and clinical management. Harper and Row: Philadelphia; 1985. P 277-385.

29. Goss DA, Van veen HG, Rainey BB, Feng B. Ocular component measured by keratometry, phakometry, and ultrasonography in emmetropic and myopic optometry student. Optom Vis Sci 1997; 74:489-95.

30. Muller-Treiber A, Joos RE, Bussacker H, Schmid P, Trachsel M. Vera¨nderung der Corneadicke unter Silicon-Hydrogellinsen gemessen mit dem Breitbandreflektometer. Die Kontaktlinse 2001; 7-8:11-6.

31. Mitsugu Shimmyo, Pasul N. Orloff. Corneal Thickness and Axial Length. Am J Ophthalmol 2005; 139:553-4.