To evaluate of the effect of an ideal fit of RGPs on HOA and keratoconus indices and its effect on psychological patient’s durability of RGP.

In this cohort study,65 keratoconus eyes with more than 3 lines(Snellen)improvement between BSCVA and BCVA(RGP)were imaged with Pentacam and their topometric and Zernike analysis findings without RGP were recorded. After 6 months or later of RGP fitting(Rose-K,Boston XO2),imaging with pentacam was repeated and the above information were recorded.

65 different grades of keratoconus eyes with mean age of 27.32 +_ 5.51 yrs/old enrolled including M 28(43.1%)and F 37(56.9%) . 44(67.7%)with family Hx of Kc and 21(31.25%)without any Kc in their families.54(83.1%) with and 11(16.9%) without any ocular allergy Hx .Maximum percent of age of onset of kc was 15 ys/old(29.2%).This study showed there are meaningful correlations between Pentacam indices and HOA in each grade of Kc with and without RGP .92.3% of patients had foreign body sensation but 96.9% had 11-20 hours/day RGP wear that confirms on psychologic effect of an ideal fit on patient’s motivation.

With regard of the three points touch principle of RGP fitting in Kc corneas ,the patients will have a decrease in HOA and improvement of RGP durability and so delayed need for PK or LK .