Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34540
Title: Orthokeratology for slowing myopic progression in a pair of identical twins
Authors: Chan, KY
Cheung, SW
Cho, P 
Keywords: Orthokeratology
Twins
Myopic control
Axial length
Refractive errors
Issue Date: 2014
Publisher: Elsevier
Source: Contact lens and anterior eye, 2014, v. 37, no. 2, p. 116-119 How to cite?
Journal: Contact lens and anterior eye
Abstract: Purpose: To compare the axial length elongation and change in refractive errors in a pair of identical twins wearing orthokeratology (ortho-k) and single vision lenses (SVLs), respectively.
Case report: Identical Twin A and B, who were 8 years of age, with the same amount of near activities, were assigned to wear ortho-k and SVLs randomly and they were monitored for two years for myopic progression. Twin A and B were assigned to wear ortho-k and SVLs, respectively. Myopic progression was evaluated by the change in axial length and in refractive errors. A faster axial length elongation was observed in each eye of Twin B during the two-year study period. The overall change in axial length was 0.52 mm (OD) and 0.70 (OS) in Twin A and 0.77 mm (OD) and 0.82 mm (OS) in Twin B. In terms of cycloplegic refractive errors (SER), one month after ceasing lens wear (after completion of the two-year study), the increase (from baseline) were 11% (OD) and 48% (OS) in Twin A and 87% (OD) and 67% (OS) in Twin B.
Conclusions: Ortho-k is more effective in controlling myopic progression in terms of axial elongation than wearing SVLs in this pair of identical twins.
URI: http://hdl.handle.net/10397/34540
ISSN: 1367-0484 (print)
DOI: 10.1016/j.clae.2013.09.007
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