Corneal power measurement with a rotating Scheimpflug imaging system after Descemet-stripping automated endothelial keratoplasty.
OBJECTIVE
To evaluate alterations in corneal power parameters after Descemet-stripping automated endothelial keratoplasty (DSAEK) using rotating Scheimpflug imaging.


METHODS
University of Texas, Southwestern Medical Center, Dallas, Texas, USA.


METHODS
Eyes that had DSAEK were evaluated with a rotating Scheimpflug imaging system (Pentacam). The outcome parameters were mean anterior and posterior keratometry (K), mean anterior radius of curvature and posterior radius of curvature, anterior and posterior astigmatism, central corneal thickness (CCT), true net power, corneal volume, keratometric power deviation, and mean zonal-equivalent K readings. These values were compared with those in a control group of age and sex-matched normal eyes.


RESULTS
The DSAEK group comprised 32 eyes (28 patients) and the control group, 32 eyes. The mean anterior K, posterior K, and true net power were 42.53 diopters (D) +/- 1.52 (SD), -6.80 +/- 0.55 D, and 40.55 +/- 1.79 D, respectively, in the DSAEK group and 43.60 +/- 1.62 D, -6.20 +/- 0.31 D, and 42.49 +/- 1.57 D, respectively, in the control group. The posterior radius of curvature, anterior and posterior K values, and true net power were statistically significantly lower in DSAEK eyes than in control eyes (P<.01). The equivalent K readings were significantly lower in all zones in DSAEK eyes than in control eyes (P<.01). The mean CCT was significantly higher in DSAEK eyes than in control eyes (628 +/- 46 mum versus 553 +/- 35 mum) (P<.01).


CONCLUSIONS
The true net power of the cornea decreased significantly after DSAEK, mainly because of an increase in posterior curvature.


BACKGROUND
No author has a financial or proprietary interest in any material or method mentioned.
Prasher
Pawan
P
Department of Ophthalmology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9057, USA.
Muftuoglu
Orkun
O
Bowman
R Wayne
RW
Cavanagh
H Dwight
HD
McCulley
James P
JP
Mootha
V Vinod
VV
D000368:Aged; D003315:Cornea / Q000033:anatomy & histology* / Q000502:physiology*; D057111:Descemet Stripping Endothelial Keratoplasty; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D018918:Phacoemulsification; D010781:Photography / Q000379:methods*; D011184:Postoperative Period; D019591:Pseudophakia / Q000209:etiology