Research Article
Risk Assessment for Corneal Ectasia following Photorefractive Keratectomy
Table 3
Literature review—demographic and pre- and postoperative data.
| Eye number | Reference year | Number of eyes | Number of pts. | Age (years) | Sex | Eye | Preoperative refraction | Topographic findings | Measured pachyc (μm) | Ablation depth (μm) | Calculated RSBd (μm) | Retreate | Time to onset of ectasia (months) | Family history | Ocular history | Sphere (D) | Cylinder (D) | BSCVAa (Snellen) | SEQb (D) |
| 1 | 2000 [12] | 2 | 1 | 41 | F | R | −4.00 | −3.50 | 0.7 | −5.75 | KCNf or FFKCNg | — | — | — | 1 | — | | | 2 | | | | | | L | −5.50 | −2.50 | 0.7 | −6.75 | KCN or FFKCN | — | — | — | 1 | — | | | | 3 | 2002 [11] | 2 | 2 | 34 | M | L | −12.00 | −1.50 | 0.5 | −12.75 | Normal | — | 144 | — | 1 | 46 | | Amblyopia | 4 | | | | 39 | M | R | −3.00 | −4.50 | 0.3 | −5.25 | KCN | — | — | — | 0 | 10 | | KCN | | 5 | 2006 [6] | 2 | 1 | 22 | M | R | −1.50 | −1.00 | 1.0 | −2.00 | D sign | 495 | 32 | 413 | 0 | 52 | | | 6 | | | | | | L | −1.50 | −1.00 | 1.0 | −2.00 | SRAXh −60° I-Si −0.9 (susp. FFKCN) | 495 | 30 | 415 | 0 | 52 | | | | 7 | 2006 [13] | 4 | 2 | 37 | M | R | −1.50 | −2.50 | 1.0 | −2.75 | I-S ~3 | 472 | 53 | 369 | 0 | 0.25 | | | 8 | | | | | | L | −4.00 | −3.00 | 0.7 | −5.50 | Central steep.j | 441 | 100 | 291 | 0 | 0.25 | | | 9 | | | | 40 | M | R | −4.75 | −3.75 | 1.0 | −6.63 | SBTk | 509 | 98 | 365 | 0 | 10 | Sister had bil. PKl | Eye rubber | 10 | | | | | | L | −5.25 | −4.00 | 1.0 | −7.25 | SBT | 508 | 106 | 356 | 0 | 1.5 | | 11 | 2006 [9] | 2 | 1 | 42 | M | R | −9.25 | −1.25 | 0.8 | −9.88 | SBT | 477 | 142 | 285 | — | 18 | | | 12 | | | | | | L | −8.25 | −2.00 | 0.8 | −9.25 | SBT | 481 | 133 | 298 | — | 18 | | | | 13 | 2007 [10] | 5 | 4 | 38 | F | R | −7.00 | −3.00 | — | −8.50 | Inf. steep.m | 520 | — | — | 0 | 36 | | | 14 | | | | | | L | −6.00 | −4.00 | — | −8.00 | Inf. steep. | 510 | — | — | 0 | 36 | | | 15 | | | | 31 | M | R | −4.50 | −1.75 | 1.0 | −5.38 | SBT | 487 | — | — | 0 | 13 | | LE KCN s/p PKn | 16 | | | | 31 | M | L | −3.75 | −0.50 | 1.0 | −4.00 | Inf. steep., SRAX | 492 | 91 | 351 | 0 | 30 | | | 17 | | | | 38 | F | L | −1.50 | −1.25 | 1.0 | −2.13 | Inf. Steep. | 509 | 50 | 409 | 0 | 4 | | | | 18 | 2007 [8] | 2 | 1 | 35 | M | R | −3.00 | −1.50 | 1.0 | −3.75 | ABTo | 497 | 67 | 380 | 0 | 0.5 | Sister with KCN | Eye rubber | 19 | | | | | | L | −3.00 | −2.00 | 1.0 | −4.00 | ABT | 511 | 70 | 391 | 0 | 0.5 | | 20 | 2008 [7] | 1 | 1 | 25 | M | R | −5.75 | −1.75 | 0.8 | −6.63 | I-S ~4 | 500 | 70 | 380 | 0 | 60 | | | | | Total | 20 | 13 | — |
|
| — | — | — | — | — | — | — | — | — | — | | | | Mean | — | — | 34.8 | — | — | −4.75 | −2.31 | 0.8 | −5.91 | — | 494 | 80 | 362 | — | 21.62 | | | | SD | — | — | ±6.0 | — | — | ±2.78 | ±1.17 | ±0.2 | ±2.87 | — | ±20 | ±35 | ±45 | — | ±20.7 | | | | Min | — | — | 22 | — | — | −12.00 | −4.50 | 0.3 | −12.75 | — | 441 | 30 | 285 | — | 0.3 | | | | Max | — | — | 42 | — | — | −1.50 | −0.50 | 1.0 | −2.00 | — | 520 | 142 | 415 | — | 60.0 | | |
|
|
aBest spectacle-corrected visual acuity; bspherical equivalent; cpachymetry; dresidual stromal bed; enumber of enhancements; fkeratoconus; gform fruste keratoconus; hskewed radial axis; iinferior-superior value; jcentral steepening; ksymmetric bowtie; lbilateral penetrating keratoplasty; minferior steepening; nleft eye keratoconus status post penetrating keratoplasty; oasymmetric bowtie. Measured RSB.
|