Clinical efficacy observation of Toric orthokeratology in myopic adolescent with moderate to high astigmatism for 1 year

Abstract

Objective To observe the clinical efficacy of Toric design orthokeratology for myopia adolescents with moderate to high astigmatism. Methods A retrospective study. Twenty-four patients (40 eyes, Spherical group), were fitted with spherical orthokeratology lenses and 11 patients (18eyes, Toric group), were fitted with Toric design orthokeratology. Comparison of two groups 1 year eye axis of two different design orthokeratology. Patients fitted with Toric design orthokeratology lenses were measured uncorrected visual acuity (UCVA), corneal astigmatism and mean corneal curvature before lens wear and after wearing the lenses for 1 week, 1 month, 6 months, and 1 year. The relationship among the orthokeratology alignment zones curvature, flat K, corneal curvature with corneal diameter 5mm, 4mm place were analyzed. Date was analyzed with paired t test, independent samples t test and one-way ANOVA. Results After I year, AL increased by 0.25±0.14 (mm), 0.23±0.28 (mm) in the Spherical group and Toric group, indicating a statistically significant difference compared with those lens wear (t=-10.868, P 0.05). The uncorrected visual acuity (UCVA) had a statistically significant difference compared with UCVA before lens wear (F=83.185, P 0.05). Average corneal curvature had a statistically significant difference before and after lens wear (P 0.05), while had statistically significant difference with 5mm corneal diameter curvature (P <0.05). Conclusions Toric design and spherical design orthokeratology have similar effects in AL control with adolescents. Toric design orthokeratology can be fitted on myopic patients with moderate-to-high corneal astigmatism, and can improve the UCVA, reduce the corneal curvature, effectively and safely. Key words: Toric design Othokeratology; Corneal astigmatism; Myopia; Axial length