Horizontal and vertical centration
- Use the common proven methods with a pupillometer or a PD stick to determine the monocular distance PD. Mark the center of the pupils on the demos, being careful to avoid parallax error.
- To determine the fitting height, the patient should be wearing the anatomically-adjusted frame and looking horizontally straight ahead at a distant object. Patient's body should be in a comfortable, natural position.
- In prismatic prescriptions, the ray deviation caused by the prism must be taken into account.
- When dispensing the eyewear, make sure that the centering crosses on the finished lenses are aligned with the pupil centers while the patient is looking at a distant object.
- The same fitting procedure is used for GT2™ by ZEISS, Gradal®Top and Gradal® RD.
Gradal® Top
- Zero visual direction, monocular distance PD.
- Recommended fitting height is 18 mm from the center of the pupil to the deepest point of the frame.
Gradal® RD
- Zero visual direction, monocular distance PD.
- Minimum 25 mm from the center of the pupil to the deepest point of the frame.
Determining lens size.
- Mark the patient's distance PD and fitting height on the demos by creating a cross.
- Place the frame with the demo lenses on the appropriate side of the cut-out chart.
- Align the crosses on the demo lenses with the centering crosses on the cut-out charts. Determine the required size of the uncut lens. If the lens does not fit, we recommend choosing another frame.
|  General Fitting Recommendations for ZEISS Lenses
Fitting of Gradal® Individual & Short i Lenses |