RESUMEN
AIM: To elucidate whether differences exist in the impact on retarding the elongation of axial length (AL) among children with myopia when utilizing orthokeratology (ortho-k) lenses employing the corneal refractive therapy (CRT) design versus those employing the vision shaping treatment (VST) design. METHODS: This retrospective clinical trial aimed to collect and analyze AL data from individuals who wore ortho-k lenses for three years. A total of 654 subjects were enrolled and prescribed one of the three specific brands of ortho-k lenses: CRT, Euclid, and Mouldway. The study's primary focus was to compare the rates of AL elongation and myopic progression across these three brands of ortho-k lenses. RESULTS: In the 3-year follow-up, the AL elongation exhibited variations of 0.73±0.36 mm in the CRT lens group, 0.59±0.37 mm in the Euclid lens group, and 0.63±0.38 mm in the Mouldway lens group. A noteworthy disparity emerged between the CRT and Mouldway groups (P<0.01), as well as between the CRT and Euclid groups (P<0.001). Additionally, it was observed that 32.1% of participants who wore CRT lenses experienced a decelerated progression of myopia, in contrast to 47.2% in the Euclid group and 44.4% in the Mouldway group. Statistical analyses revealed a statistically significant distinction between the CRT and Euclid groups (P<0.01), and similarly, the CRT group demonstrated a statistically significant difference when compared to the Mouldway group (P<0.05). CONCLUSION: Ortho-k lenses represent a pragmatic strategy for mitigating the advancement of myopia. In contradistinction to ortho-k lenses utilizing the CRT design, those employing the VST design exhibited a more favorable impact regarding retarding AL elongation.
RESUMEN
OBJECTIVE: To compare spherical aberration and visual quality in pseudophakic patients with a modified prolate aspheric intraocular lens (IOL) with patients with a spherical IOL. METHODS: A prospective study of 169 consecutive cases (169 eyes) was conducted. All cataract patients underwent phacoemulsification were randomized to receive an aspheric IOL or a spherical IOL. The following investigations were performed to assess the spherical aberrations of total eye and cornea, best corrected visual acuity (BCVA), near visual acuity (NVA), contrast sensitivity, glare sensitivity and apparent accommodation. RESULTS: The mean spherical aberration in eyes with a Tecnis IOL [(0.024 +/- 0.076) microm] was significantly lower than that of eyes with a spherical IOL [(0.217 +/- 0.137) microm, P = 0.000]. In addition, Tecnis IOL provided improved contrast sensitivity at 4.0 degrees (39.18 +/- 11.94 versus 33.28 +/- 11.84, P = 0.009) and 2.5 degrees (28.30 +/- 12.07 versus 24.50 +/- 8.20, P = 0.033) visual angles, and improved glare sensitivity at 6.3 degrees (30.90 +/- 9.21 versus 27.08 +/- 8.24, P = 0.022), 4.0 degrees (27.09 +/- 8.45 versus 23.30 +/- 6.24, P = 0.008), 2.5 degrees (19.20 +/- 8.71 versus 15.53 +/- 4.37, P = 0.005) and 1.6 degrees (12.08 +/- 4.44 versus 10.04 +/- 4.20, P = 0.014) visual angles. The difference of BCVA, NVA and apparent accommodation between these two groups was not significant. CONCLUSIONS: The present clinical results demonstrated that an aspheric IOL may reduce the spherical aberration and improve visual performance of pseudophakic eyes as compare to conventional spherical IOL.