Research Article
The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes
Table 1
Contact lens parameters used during the study.
| | Parameter | 6 mm OZ lens design | 5 mm OZ lens design |
| | Manufacturer | Paragon vision sciences (Gilbert, AZ) | Paragon vision sciences (Gilbert, AZ) | | Material (USAN) | Paflufocon D | Paflufocon D | | Brand | Paragon CRT | Paragon CRT | | Back surface geometry | Sigmoid geometry | Sigmoid geometry | | Front surface geometry | Mirrored with anterior surface | Mirrored with anterior surface | | Overall diameter | 10.50 | 10.50 | | Optic zone diameter | 6.00 | 5.00 | | Reverse curve (RZD) width | 1.00 | 1.00 | | Landing curve (LZA) width | 1.00 | 1.50 | | Power fitted (D) | +0.50 | +0.50 | | Back optic zone radius (mm) | 7.90 to 8.90 | 7.90 to 8.90 |
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