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Differentiations in thickness of corneas in high myopic eyes
Author(s) -
BASLI E,
TOUZEAU O,
BORDERIE VM,
LAROCHE L
Publication year - 2010
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2010.488.x
Subject(s) - emmetropia , quadrant (abdomen) , ophthalmology , medicine , cornea , corneal topography , mathematics , anatomy , refractive error , eye disease , surgery
Purpose To compare the corneal thickness of eyes with high myopia with that of emmetropic eyes. Methods One hundred corneas of 50 myopic patients (axial length >26 mm) and 100 corneas of 50 emmetropic patients (spherical equivalent between –1D and +1D) were prospectively analysed by means of Orbscan and ultrasonic pachymetry. The location of related points to apex, which were quantified using the rectangular coordinates (x, y) of the thinnest point, were used to determinate the location of the quadrant and the distance between this thinnest point and the centre (Pythagoras theorem). Results In the myopic group, the axial length was 27.2+/‐1.6mm (26.1 to 33.1mm) and the subjective spherical equivalent was –8.17+/‐1.72D (‐19.2 to –5.6D). As compared with emmetropic eyes the corneal thickness was significantly lower (p<0.001) in the myopic group: 526μm vs 543μm (US pachymetry) and 528μm vs 545μm (Orbscan). The distribution of the quadrant in not different for the two groups (p=0.26). The localisation is more frequent in the temporal quadrant (63%), followed by the inferior (23%), superior (9.5%) and finally nasal quadrant (4.5%). The distance of this thinnest point and the apex in not different (0.89 mm vs 0.85 mm, p= 0.30). Conclusion Corneas of high myopic patients are thinner than corneas of emmetropic patients. However the others characteristics of the corneal thickness including the thinnest point are not different in the two groups.