Table 3 Correlation between visual acuity, coma aberration, HOAs, opacity grade, bullous stage, and CCT.

From: Corneal higher-order aberrations in corneal endothelial decompensation secondary to obstetric forceps injury

 

4 mm zone

6 mm zone

Coma aberration

   Total cornea

0.28 (0.21)

0.482 (0.02)

   Anterior surface

0.454 (0.03)

0.504 (0.02)

   Posterior surface

− 0.166 (0.46)

− 0.018 (0.94)

HOAs

   Total cornea

0.321 (0.14)

0.383 (0.071)

   Anterior surface

0.374 (0.08)

0.471 (0.02)

   Posterior surface

− 0.014 (0.95)

0.056 (0.80)

Opacity gradea

0.700 (< 0.001)

Bullous stageb

0.675 (< 0.001)

CCT

0.175 (0.43)

  1. Data are expressed as Spearman's correlation coefficient rs (P).
  2. Bold numbers indicate P < 0.05.
  3. CCT, central corneal thickness; DM, Descemet’s membrane; HOAs, higher order aberrations; IQR, interquartile range; SA, spherical aberration.
  4. acorneal opacity grade; 0, clear or trace haze; grade 1, mild opacity; grade 2, moderately dense opacity partially obscuring the details of the iris; and grade 3, severely dense opacity obscuring the details of the intraocular structures.
  5. bThe severity of bullous keratopathy was defined as follows: stage 1, slight stromal edema or increased corneal thickness due to reduction in corneal endothelial cells; stage 2, stromal edema with DM folds; stage 3, stromal edema and DM folds with apparent epithelial bullae; stage 4, stromal scarring and corneal neovascularisation.
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