THE CLINICAL STUDY TO ASSESS THE CORNEAL THICKNESS BY USING PACHYMETRY IN VARIOUS TYPES OF REFRACTIVE ERRORS IN AGE GROUP (10 - 40 YRS.)
Journal Title: Journal of Evolution of Medical and Dental Sciences - Year 2017, Vol 6, Issue 46
Abstract
BACKGROUND The purpose of the study is to measure the corneal thickness in various refractive errors in the age groups 10 - 40 yrs. by using ultrasonic pachymetry and to analyse corneal thickness measured in various refractive errors. The study was conducted in Govt. Dharmapuri Medical College Hospital. The patients attending the Eye Outpatient Department for defective vision due to refractive error were subjected for corneal thickness measurement using ultrasonic pachymetry. MATERIALS AND METHODS Patients screened for refractive error were under the age group of 10 - 40 yrs. Patients underwent dilatation and retinoscopy and post-mydriatic test was done. Patients were prescribed glass for their subjective acceptance. Patients were subjected to corneal ultrasonic pachymetry to measure the corneal thickness in micrometres after putting 4% xylocaine local anaesthetic drops. RESULTS In our study among 300 patients of refractive error of age group (10 - 40 yrs.) had Mean Central Corneal Thickness (CCT) of 535 micrometres (SD 32) with the range of CCT of 410 - 590 micrometres. Among 300 patients, 160 patients of myopes had corneal thickness of 541 mm (SD 31) micrometres. Among 300 patients, 32 patients of high myopes had corneal thickness of 537 micrometres (SD 27); 48 patients among 300 patients of myopic astigmatism had average corneal thickness of 512 micrometres SD (37); 32 patients/300 patients with hypermetropic astigmatism had corneal thickness of 535 micrometres (SD 30). Hypermetropes (60 patients/300 patients) had average corneal thickness of 545 micrometres (SD 34). CONCLUSION Corneal ultrasonic pachymetry measures the thickness of the cornea. There was no correlation between various refractive errors of age group 10 - 40 yrs. and central corneal thickness. Though corneal thickness was observed to be comparatively less, 512 micrometres (SD 37 mm), in case of myopic astigmatism. In high myopes, more stromal ablation is needed to achieve optical correction which renders the postoperative cornea even thinner. The corneal flap thickness decreased in thinner corneas and the visual outcomes was slightly worse in thin corneal flap groups. For high myopes, refractive procedures for myopic correction other than LASIK (Laser in situ keratomileusis), might be more important. The use of ultrasound pachymetry in keratoconic corneas is questionable, because of change in refractive index (Inferior Apical Cone). When compared with orbscan II. In conclusion, changes that occurs in the anterior segment as the eyeball elongates in myopia progression included flatter corneal curvature and decreased corneal thickness. These factors should be taken into account before refractive surgeries to prevent progressive corneal ectasia termed iatrogenic keratoconus.
Authors and Affiliations
Elangovan Marudhamuthu, Savitha Savitha, Sivakumar N
Keywords
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- EP ID EP217384
- DOI 10.14260/Jemds/2017/777
- Views 78
- Downloads 0
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