Table 1.
Surgical procedures for the correction of post-penetrating keratoplasty ectasia. The number of eyes, the outcomes of the procedures are summarized.
| Procedure | Operated Eyes | Results | |
|---|---|---|---|
| Limberg et al. | Compressive suture | 5 | A 58% reduction of average cylinder in 1 week; reduction of 41% of average cylinder at 9–12 months |
| Roper-Hall and Atkins et al. | Compressive suture | 1 | 8 compression sutures to treat 10 D of refractive cylinder. |
| Kirkness et al. | Compressive suture & arcuate keratotomy | 38 | Reduction of 3.6 D–5 D in astigmatism |
| Javadi et al. | Compressive suture | 77 | A mean reduction of 3.4 D and 5.9 D in keratometric astigmatism |
| Mejia et al. | Wedge resection | 39 | Astigmatic cylinder improved from 7.99 D to 2.5 D at 12 months and remained stable thereafter |
| Ilari et al. | Wedge resection | 3 | Preoperative astigmatism decrease and corneal profile regularized |
| Nuijts et al. | IOL implantation (Artisan toric lens) | 16 | Spherical equivalent decreased from 5.50 D before surgery to 0.86 D at final follow-up |
| Tahzib et al. | IOL implantation (Artisan toric lens) |
36 | Spherical equivalent decreased from 4.31 D preoperatively to 1.20 D at the last follow-up |
| Akcay et al. | IOL implantation (Toric ICL) | 1 | Patient manifest refraction improved from −8.0/−1.75 at 170° preoperatively, to −0.75/−0.50 at 130° postoperatively |
| Alfonso et al. | IOL implantation (Posterior chamber phakic intraocular lenses) | 15 | The mean postoperative spherical equivalent was 0.95 D |
| Al Mezaine et al. | Repeat PK | 210 | 29.6% of the eyes achieved a final visual acuity greater than 20/200, while only 4.8% reached 20/40 or better |
| Daniel J. Weisbrod et al. | Repeat PK | 116 | 2 and 5-year survival rates for repeat PKP were 63.9% and 45.6%, respectively |
| Szentmàry et al. | Repeat PK | 17 | Visual acuity improved significantly from 0.2 to 0.5 |
| Vajpayee et al. | Tuck In Lamellar Keratoplasty | 12 | Kmean decreased, and the mean spherical equivalent (SEQ) refractive error decreased |
| Yang et al. | Tuck In Lamellar Keratoplasty with an lenticule | 3 | The mean min K value measured by topography preoperatively and 1 day, 1 month, 3 months and 12 months postoperative was 44.86 ± 3.92, 48.83 ± 2.38, 50.63 ± 4.24, 49.71 ± 3.26 and 50.07 ± 3.43 respectively. The max K value increased significantly after the operation and then declined gradually |
| Malbran et al. | Peripheral Reconstructive Lamellar Keratoplasty | 33 | Preoperatively, the mean keratometric measures were K1: 44.8 D and K2: 54.1 D and postoperatively K1: 47.5 D and K2: 50.8 D. |
| Cheng et al. | C-shaped lamellar keratoplasty | 3 | All eyes achieved Snellen visual acuity of 20/40 or better and stable astigmatism ranging from 0 to 2.75 diopter cylinder within 6 months |
| Lake et al. | DALK Overlay | 7 | At 12 months, mean UCVA improved from 1.157 to 0.74 Logmar. Mean BCVA improved from 0.82 to 0.37 at 12 months |
| Scorcia et al. | DALK Overlay (small bubble) | 9 | BCVA improved by at least 4 Snellen lines |
| Patel et al. | Microkeratome-Assisted Superficial Anterior Lamellar Keratoplasty | 9 |
BCVA improved in all 9 eyes at final follow-up. Refractive astigmatism also improved by an average of 0.7 diopters. |
| Gutfreund et al. | Microkeratome-Assisted Anterior Lamellar Keratoplasty (MALK) | 4 | 3 years after MALK, BCVA improved to 20/20, refractive astigmatism decreased of an average of 2.1 D (in all cases within 4.5 D), and the average surface asymmetry index decreased from 2.27 to 0.56 |