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This trial frame has several knuckle screw adjustments which make it possible to adapt the frame to various shapes of patient heads. There are two clips in the frame which can hold up to four lenses to achieve the appriopriate prescription for each eye.
This trial frame has several knuckle screw adjustments which make it possible to adapt the frame to various shapes of patient heads. There are two clips in the frame which can hold up to four lenses to achieve the appriopriate prescription for each eye.
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Technical Indexes
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| 1.Range of PD adjustments： | PD of both eyes：48～80mm；Left or right PD：24～40mm；Minimum Calibration Value：1mm. |
| 2. Axial calibration on each disc： | Left disc：120°～0°～135°，Right disc： 45°～180°～60°，Axial calibration increases counter clockwise along the lens frame axis, and the calibration distance is 5. |
| 3. Inner diameter of lens frame： | Φ32.5mm |
| 4. The Number of lens which can be inserted into left or right lens frame simultaneously： | 4 pieces |
| 5. Degree of lens rotating around optical axis in the lens frame： | 360° |
| 6. Non-parallelism degree between lens’ optical axis and lens frame’s geometric axis： | ≤2.5° |
| 7. Non-concentricity between lens’ optical center and lens frame geometric center： | ≤0.5mm |
| 8. Displacement of lens in relation to position of lens frame geometric center： | ≤0.3mm |
| 9. Range of nose pad adjustment： | Length：0～14mm；Angle：0°～30° |
| 10. Range of left or right lens frame leg’s length adjustment： | 98mm～135mm |
| 11. Maximum interval between left and right lens frame legs： | 200mm |
| 12. Weight： | 72g |
| Weight | 2 lbs |
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| Dimensions | 1 × 1 × 1 in |
