Session Title: Refractive
Session Date/Time: Sunday 17/02/2013 | 08:30-11:00
Paper Time: 10:16
Venue: Hall 3
First Author: : N.Gabric CROATIA
Co Author(s): : M. Bohac
Purpose:
To evaluate safety and efficacy of LASIK procedure in high hypermetropia.
Setting:
University Eye Hospital Svjetlost, Zagreb, Croatia
Methods:
Prospective study on 18 patients (28 eyes) who underwent LASIK procedure for high hypermetropia in a period from January to March 2012. Patients were divided in two age groups. First group was younger than 40 years (30.5±5 years) and second group was older than 40 years (46.8±4 years). In the first group 12 patients (19 eyes) were enrolled. Mean preoperative sphere was +4.72±0.69D (range from +4.00 to +6.25D), mean preoperative cylinder was 0.90±0.56D (range from +0.25 to +2.25D). In the second group 6 patients (9 eyes) were enrolled. Mean preop sphere was +4.56±0.46D (range from +4.00 to +5.25D), mean preoperative cylinder was 0.50±0.31D (range from +0.25 to +1.00D). Mean preoperative keratometric values for first group were 42.04±1.33D and for second group 42.36±1.92. All ablations were performed on Schwind Amaris 750Hz excimer laser with Aberration Free module. All flaps were cut with Moria M2 mechanical microkeratome. Preoperative and postoperative uncorrected and best corrected distant (UCDVA, BCDVA) and near (UCNVA, BCNVA) visual acuity were measured and amount of high order aberrations (Root mean square-RMS, coma, trefoil and spherical aberration-SA) at 3 and 5mm pupil. Two tailed Student t-test was used for statistical analysis. Follow up was 6 months.
Results:
For first group mean postoperative sphere was 0.69±0.84D (range -0.87 to +2.00D), cylinder was -0.34±0,64D (range -1.25 to +0.75D). Difference wasn’t statistically significant between preoperative BCDVA and postoperative UCDVA (p=0.489) or preoperative and postoperative BCDVA (p=0.301).
RMS decreased with statistically significant difference (p<0.0001). Coma increased with statistically significant difference (p=0.003, p=0.002). Trefoil increased with no statistically significant difference at 3mm pupil (p=0.071), difference was significant for 5mm pupil (p=0.014). SA remained unchanged and there wasn’t statistically significant difference (p=0.175, p=0.069).
For second group mean postoperative sphere was 0.50±0.92D (range -0.87 to +1.37D), cylinder was -0.44±1.04D (range -1.12 to -0.37D). Difference wasn’t statistically significant between preoperative BCDVA and postoperative UCDVA (p=0.7283) or preoperative and postoperative BCDVA (p=0.942). There wasn’t statistically significant difference between preoperative and postoperative near addition p=0.313 (1.36±0.47D vs 1.13±0.31D).
RMS decreased with statistically significant difference (p<0.0001, p=0.029). Coma increased - difference at 3 mm pupil wasn’t statistically significant (p= 0.096), and for 5 mm pupil was significant (p= 0.003). Trefoil increased - difference at 3mm pupil wasn’t statistically significant (p=0.538), and for 5mm pupil was significant (p=0.029). SA showed slight increase with statistically significant difference for 3mm pupil (p= 0.021), at 5 mm pupil difference wasn’t significant (p=0.132).
Conclusions:
LASIK treatment for high hypermetropia showed good results in terms of visual acuity however more test are necessary to perform to asses visual quality due to increase in high order aberrations especially coma.
Financial Disclosure:
None
