Sequential Versus Combined Penetrating Keratoplasty and Cataract Surgery

Abstract

Sequential surgery appears to offer no significant advantages over the triple procedure in terms of refractive predictability or variability. There was a slight trend toward more patients achieving 6/12 or better vision in the sequential group.

Evaluation of an interlaced triple procedure

“…Triple surgery involving penetrating keratoplasty (PKP), extracapsular cataract extraction (ECCE), and intraocular lens (IOL) implantation is an effective treatment for patients with corneal pathologies complicated by cataracts. [ 1 – 12 ] Compared with staged surgery, the most important advantages of triple surgery are that it leads to quick improvements in visual acuity, avoids the adverse effects of a second surgery on the donor corneal button, and reduces costs. [ 1 , 3 , 5 , 8 , 13 ] However, traditional triple surgery can involve more risk compared to staged surgery because performing IOL implantation in the open-sky state entails a longer open state duration, which increases the intraoperative risks and difficulty of accurately and safely inserting the IOL into the capsular bag.…”

Intrastromal corneal ring segments: Effect of relationship between alignment and topographic keratometric meridians

“…11 The standard deviation (SD) and 95% confidence intervals (CIs) were calculated on the independent variables f 11 ; f 12 ; f 22 of the row matrix and then transformed back into spherocylinder notation. The data are therefore presented in standard notation as the mean, SD, 12 and 95% CI (S/C axis) in the text, tables, and Figure 1. Keratometric data are similarly presented as k1/(k2 À k1) @ meridian; for example, k1: 43 diopters (D), k2: 45 D @ 90 is presented as 43/3 @ 90.…”

Quantification of the surgically induced refractive effect of intrastromal corneal ring segments in keratoconus with standardized incision site and segment size

“…There was, however, considerable variability, as shown in the SD of the refractive effect (95% CI, À13.11 C10.23 Â 63. 16 a flattening orthogonal to the incision site, with steepening in the axis of the incision site.…”

“…15 The standard deviation (SD) and 95% confidence intervals (CIs) were calculated on the independent variables f 11 ,f 12 ,f 22 of the row matrix and then transformed back into spherocylinder notation. The data are therefore presented in standard notation as the mean, SD, 16 and 95% CI (sphere, cylinder, axis) in the text and tables. Keratometric data are similarly presented as K1/(K2 À K1) @ meridian, where K1 is the flattest K power and K2 À K1 is the difference between powers in the steepest meridian and flattest meridian.…”