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DIOPTRX™
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TeleVue.com: Eyepiece Accessories > DIOPTRX™ > How to Choose |
How to Choose DIOPTRX™ Models
Your prescription may look like this, with different numbers.
| SPHERICAL | CYLINDER | AXIS | ||
| Right Eye | O.D. | +1.50 | -0.50 | 45 |
| Left Eye | O.S. | -0.50 | +1.50 | 135 |
Simply choose DIOPTRX™ to match the cylinder (astigmatism) value of your preferred viewing eye. In the example above, you would choose 0.5 diopter model for your right eye and 1.5 diopter model for your left eye.
- Ignore spherical and axis values.
- Ignore all ± signs.
Pupil Size vs. Astigmatism
Maximum pupil size decreases with age and this decrease the visibility of astigmatism. Consult the following charts.
Eye Pupil Size vs. Age
Exit Pupil Size vs. Astigmatism Visibility
Note:
Long Eye-Relief Tele Vue Eyepieces that Accept DIOPTRX™
| Plössl | 55, 40, 32mm |
| DeLite | all |
| Apollo 11 | yes |
| Panoptic | 41, 35, 27, 24*, 19mm* (*requires DEA-0001 adapter) |
| Delos | all |
| Nagler Type 4 | 22, 17, 12mm |
| Nagler Type 5 | 31, 26, 20mm* (*requires DEA-0001 adapter) |
| Nagler Type 6 | all* (*requires DNA-6000 adapter) |
| Ethos | all |
