Biometry of the Cornea in Myopic Chinese Patients

Abstract

Axial length appears to be the main morphological parameter related to myopia. Myopic corneas took the form of a rotationally asymmetric prolate ellipsoid that gradually flattened towards the periphery. The study also provided evidence of symmetry between an individual's right and left corneas.

Assessment of Pattern and Shape Symmetry of Bilateral Normal Corneas by Scheimpflug Technology

“…Therefore, the fellow corneas of the healthy subjects seem to have similar volumes and 3D configurations. This is consistent with the results of previous studies reporting symmetry in terms of pachymetric data [9,11,13,[36][37][38][39]. Specifically, Prakash et al [13] observed that minimum corneal thickness points in fellow eyes tended to be symmetrical along the vertical midline.…”

“…Several studies have been conducted to evaluate the level of interocular corneal symmetry in the normal healthy population by analyzing a great variety of parameters provided by different commercial devices used for such purpose [8][9][10][11][12][13][14][15]32,[36][37][38][39]. Specifically, high levels of interocular symmetry have been reported in variables such as corneal curvature [9,10,12,37], central corneal thickness [9,13,37,38], anterior and posterior corneal elevation [10,12,38], corneal astigmatism [9,11,36,39], minimum corneal thickness [10,12,13], corneal aberrations [14], corneal diameter [15], corneal shape factor [37], and even some biomechanical metrics [40]. This is consistent with the results obtained in our sample, as we did not find significant differences between fellow eyes in corneal asphericity, aberrations, pachymetry, and volume.…”

Scheimpflug photography–based clinical characterization of the correlation of the corneal shape between the anterior and posterior corneal surfaces in the normal human eye

“…Dubbelman et al 1 found that the anterior and posterior corneal surfaces were significantly steeper in myopic eyes than in hyperopic eyes. However, some authors report scientific evidence of no significant correlation between corneal curvature and AL 24 and or even a trend opposite 25 to that found in the Dubbelman study. In our study, the presence of a reduced anterior:posterior ratio for corneal curvature may have been related to a steep anterior corneal surface within the normal physiologic range and a posterior cornea with the average curvature as well as to an anterior corneal surface with the average curvature and a flat posterior corneal surface within the normal physiologic range.…”

Assessment of Anterior Segment Parameters of Keratoconus Eyes in an Australian Population

“…There were no significant correlations between Front Km and AL and ACD. Similarly, Bao et al 36 reported no significant correlation between corneal curvature and AL. However, Abolbashari et al 21 reported a correlation between ACD with mean K reading and Back Km.…”