Excimer laser refractive surgery : corneal wound ... - Helda - Helsinki.fi

Safety
PRK
In terms of loss/gain of visual acuity, 59% of the eyes in the VISX group at three months
maintained the preoperative BCVA, 30% gained one line, and 11% lost one line. At the
last follow-up 56% showed no changes in lines of BCVA and 22% showed increase of one
line and four % two lines; 19% lost one line. In the Nidek group, 68% of the eyes at three
months maintained the preoperative BCVA, 24% gained one line, six % gained two lines,
and three % lost one line. At the last follow-up 71% showed no changes in BCVA and
15% showed an increase of one line and three % two lines; 12% lost one line. There was
no difference between groups in terms of gain or loss of BCVA.
At the last follow-up, the mean BCVA was 0.0±0.1 (range 0.0 – -0.2) for both VISX
and Nidek groups. Compared to preoperative BCVA, no significant differences were
found at three months or at last follow-up in either group or between groups (p>0.05).
Postoperatively, in the VISX group BCVA ≤0.0 was obtained in 96%, and 100% of the
eyes at three months and at last follow-up respectively. In the Nidek group BCVA ≤0.0
was obtained in 100% at three months and in 97% of the eyes at last follow-up.
LASIK
After two years 57% showed no changes in pre-LASIK BCVA and 32% showed an
increase of one to two lines. Six % lost one line and six % lost to two lines. At last followup
42% of the eyes preserved the pre-LASIK BCVA, 34% gained one line and 18% lost
one line and five % lost two lines. Postoperatively, at two years the mean BCVA was 0.0
± 0.0 (range 0.0 - -0.2), and at the last follow-up was 0.0 ± 0.0 (range -0.1 - 0.2).
PRK VISX vs. LASIK VISX
BCVA ≤0.0 was obtained in 89% of the eyes after LASIK and in 100% of the eyes after
PRK at the last follow-up. No significant differences were found between LASIK and
PRK (p>0.05). Safety results at last follow-up after PRK and LASIK are given in Table 6.
44