Table 2.
Spherical Equivalent Refractive Error during Follow-up
| 1 Year |
2 Years |
3 Years |
||||
|---|---|---|---|---|---|---|
| SVL (n = 58) n (%) | PAL (n = 55) n (%) | SVL (n = 58) n (%) | PAL (n = 55) n (%) | SVL (n = 58) n (%) | PAL (n = 52) n (%) | |
| Change in Spherical Equivalent Refractive Error from Baseline, D* | ||||||
| Mean (SD) | −0.42 (0.37) | −0.29 (0.39) | −0.80 (0.61) | −0.58 (0.55) | −1.15 (0.75) | −0.87 (0.72) |
| Range | −1.38 to 0.70 | −1.56 to 0.82 | −2.26 to 0.84 | −2.16 to 0.78 | −2.97 to 0.38 | −3.13 to 0.22 |
| >0.00 (less myopia) | 6 (10) | 6 (11) | 5 (9) | 5 (9) | 3 (5) | 6 (12) |
| 0.00 to −0.49 | 27 (47) | 35 (64) | 11 (19) | 18 (33) | 8 (14) | 11 (21) |
| −0.50 to −0.99 | 21 (36) | 12 (22) | 19 (33) | 23 (42) | 13 (23) | 16 (31) |
| −1.00 to −1.49 | 4 (7) | 1 (2) | 17 (29) | 5 (9) | 13 (23) | 12 (23) |
| ≤−1.50 (more myopia) | 0 (0) | 1 (2) | 6 (10) | 4 (7) | 21 (36) | 7 (13) |
| Spherical Equivalent Refractive Error, D* | ||||||
| Mean (SD) | −1.88 (0.66) | −1.80 (0.63) | −2.26 (0.84) | −2.10 (0.81) | −2.60 (0.91) | −2.41 (0.95) |
| Range | −3.56 to −0.69 | −3.75 to −0.72 | −4.44 to 0.09 | −4.19 to −0.75 | −4.47 to −0.38 | −5.13 to −0.72 |
| Better than or equal to −0.49 | 0 (0) | 0 (0) | 1 (2) | 0 (0) | 1 (2) | 0 (0) |
| −0.50 to −0.99 | 4 (7) | 4 (7) | 3 (5) | 3 (5) | 1 (2) | 2 (4) |
| −1.00 to −1.99 | 30 (52) | 34 (61) | 18 (31) | 25 (45) | 14 (24) | 18 (35) |
| −2.00 to −2.99 | 21 (36) | 16 (29) | 27 (47) | 19 (35) | 21 (36) | 20 (38) |
| −3.00 to −3.99 | 3 (5) | 2 (4) | 7 (12) | 6 (11) | 17 (29) | 8 (15) |
| Worse than or equal to −4.00 | 0 (0) | 0 (0) | 2 (3) | 2 (4) | 4 (7) | 4 (8) |
A negative value indicates that the myopia worsened over time; a positive value indicates that it improved over time. Rounded percentages may not sum to 100%.
*
For baseline and each time point, a spherical equivalent was calculated for each eye for each of the five readings of cycloplegic autorefraction, and the median for each eye was averaged to obtain the spherical equivalent used for analysis. The change in average spherical equivalent was calculated by subtracting the spherical equivalent at baseline from each time point.