Table 1

Indications for subject exclusion from the analysis

ParameterEyes (n)
Previous corneal surgery (PK, LVC, RK or PTK)14
Other corneal disease (KCN, ectasia, PMD, corneal scars)15
CDVA less than 6/1223
No postoperative refraction58
Incomplete biometry or out of range of any formula27
Both eyes operated on (random exclusion)419
  • KCN, keratoconus;LVC, laser vision correction;PK, penetrating keratoplasty;PMD, pellucid marginal degeneration; PTK, phototherapeutic keratectomy;RK, radial keratotomy.