Intrastromal Corneal Ring Segment Implantation (Keraring 355°) in Patients with Central Keratoconus: 6-Month Follow-Up
Table 3
Comparison between preoperative and postoperative visual outcomes.
Preoperative
1-month postoperation
3-month postoperation
6-month postoperation
value 3 versus pre.
value 6 versus pre.
value 6 versus 3
UCVA (logMAR)
Mean (SD)
0.79 (0.48)
0.50 (0.26)
0.44 (0.25)
0.28 (0.15)
0.005**
0.001**
0.002**
BSCVA (logMAR)
Mean (SD)
0.36 (0.21)
0.34 (0.19)
0.29 (0.17)
0.18 (0.09)
0.19
0.009**
0.007**
Sphere (D)
Mean (SD)
−2.38 (1.85)
−0.33 (2.34)
−0.62 (2.79)
−0.25 (2.27)
0.052
0.019*
0.242
Cylinder (D)
Mean (SD)
−4.27 (1.25)
−2.18 (0.82)
−1.78 (1.22)
−1.88 (0.95)
<0.001**
<0.001**
0.714
SE (D)
Mean (SD)
−5.46 (1.52)
−2.35 (1.67)
−2.09 (2.19)
−2.01 (1.63)
<0.001**
<0.001**
0.822
Notes: UCVA: uncorrected visual acuity; BSCVA: best spectacle-corrected visual acuity; D: diopters; logMAR, logarithm of the minimum angle of resolution; SD: standard deviation; SE: spherical equivalent. Significances are based on paired -test. * < 0.05; ** < 0.01.
