| Study/Year | Mean Age (years) | No. of Eyes | Follow up | Reduction in Mean Shpere | Reduction in Mean Cylinder | Improvement in S Eq. | Reduction in Average K value |
| Current Study/2011 | |||||||
| Group 1 | 13.55 | 20 | 6 months | (worse 1.86D) | 1.16D | (Worse 1.28D) | 0.34D |
| Group 2 | 23.95 | 21 | 6 months | 0.74D | 0.19D | 0.9D | 1.16D |
| Wollensak et al. [20] /2003 | 32.13 | 23 | 23.2 months | NA | NA | 1.14D | 2.01D in 70% eyes |
| Raiskup-Wolf et al. [18] /2008* | >18 | 241 | 12 months | NA | 0.93D (in 50% eyes) Stable i.e. within ± 0.50D in 36% | NA | 1.46D in 56% eyes. Stable i.e. within ± 0.50D in 30% |
| Vinciguerra et al. [21] /2009 | 24 - 52 (Range) | 28 | 12 months | 0.28D | 0.26D | 0.41D | 0.58D at 6 months 6.07D at 1 year |
| Caporossi et al. [17] /2010 (The Siena Eye Cross Study) | 10 - 40 (Range) | 44 | 52.4 months | 1.62D at 1 year | 0.52D at 1year | 1.87 D at 1 year | 1.96D at 1 year |
| Hersh et al. [22] /2011 | ≥14 yrs | 49 | 12 months | NA | 0.08D | 0.85D | 1.5D |