Comparison of two different orthokeratology lenses and defocus incorporated soft contact (DISC) lens in controlling myopia progression

Table 1 Detailed information about OK lenses and SCLs

OK lenses	DRL	Euclid
Design	Base curve, reverse curve, alignment curve and peripheral curve	Base curve, reverse curve, alignment curve, and peripheral curve
TD	8.0–12.6 mm	9.6–11.6 mm
BOZD	5.0 mm	6.2 mm
RCW	0.8–1.6 mm	0.5–0.6 mm
ACW	0.3–1.1 mm	0.9–1.6 mm
Central thickness	0.20–0.25 mm	0.20–0.32 mm
Dk	100 × 10^–11(cm²/s) [mlO₂/(ml·mm Hg)]	87 × 10^–11(cm²/s)·[mlO₂/(ml·mm Hg)]
Material	Boston XO	Boston Equalens II

SCLs	DISC	Single-vision SCLs
Design	Concentric-ring and dual-focus	Single-vision
Base curve	8.6 mm	8.6 mm
Defocus addition	+ 2.50 D	None
TD	14.2 mm	14.2 mm
Central optical zone	3.0 mm	8.0 mm
Water content	38%	38%
Central thickness	0.1 mm	0.1 mm
Dk	8.4 × 10^–11 (cm²/s) ·[mlO₂/(ml·mm Hg)]	8.4 × 10^–11 (cm²/s)·[mlO₂/(ml·mm Hg)]
Material	hydroxyethyl methacrylate	hydroxyethyl methacrylate

OK = orthokeratology; DRL = double reservoir lens; DISC = defocus incorporated soft contact; SCL = soft contact lens; TD = total lens diameter; BOZD = back optic zone diameter; Dk = oxygen permeability; RCW = reverse curve width; ACW = alignment curve width

ISSN: 2326-0254