COMPUTATION OF RETINAL CONTOUR IN ANISOMYOPIA

It is well documented that myopia is associated with an increase in ax ial length of the posterior vitreous chamber. Whether equatorial or tr ansverse dimensions are likewise affected in myopia is relevant to fur ther understanding of the development of ametropia. We have utilised a computing method to determine retinal contour from real eye measureme nts of keratometry, A-scan ultrasonography and peripheral refraction a s a means of assessing the transverse dimensions of the vitreous chamb er. This technique has been applied to a 21-year-old female Caucasian anisomyope with a refractive error of R - 1.50/ - 0.50 x 130 and L - 4 .00/ - 0.50 x 160. Anisomyopia offers a special opportunity for inter- eye comparison of different degrees of myopia. The repeatability of th e technique was assessed by taking 10 separate sets of the aforementio ned measurements and thus generating 10 retinal contours for each eye. We conclude that this method is repeatable and is capable of demonstr ating differences between anisomyopic eyes although validation against in vivo measurements is required.