How the process works
- Select a frame from the EnChroma Online Store.
- Select the appropriate lens type for your prescription: Single Vision or Progressive.
- Add the item to cart, proceed to checkout, and pay for the item.
- Email or fax us a copy of your prescription with your order number.
How to send us your prescription
You can send us your prescription by email. Be sure to include your order number.
Scan or take a photo of your prescription and email it to firstname.lastname@example.org. Include your order number in the subject line.
- Make sure your prescription contains:
- Prescription information for both your right and left eye.
- Pupillary Distance (PD) number. Pupillary Distance is the distance (in millimeters) between your pupils.
- Segment height (seg height) number. (This applies only to Fit to Your Frames orders of progressive or blended bifocal lenses.)
- Your prescription should be within these ranges:
- Single Vision: SPH -4 to +3 CYL -4 to +4
- Progressive: SPH -4 to +3 CYL -4 to +4 ADD +3
- Your prescription must be current. Most prescriptions need to be renewed every two years.
Pupillary Distance (PD)
Pupillary Distance, also called PD, is the distance in millimeters between your pupils. Usually it is a number between 50-80 mm. It can also be written as the 1/2 PD (half-PD) which is two numbers, each number typically between 25-40 mm.
Often, doctors do not write the PD on their patient’s prescription. However, in many locations, doctors are required by law to provide patients with the PD if they request it. Next time you get your prescription updated, remember to ask your doctor to include the PD.
Segment Height (Seg Height or SH)
Segment Height (also called Seg Height or SH) is the vertical measurement in millimeters from the bottom of your lenses to the the top line of a bifocal or the progressive part of Progressive lenses. Segment height only applies to Fit to Your Frames orders with either progressive or blended bifocal lenses.
Out-of-range prescriptions might be possible, depending on the geometry of your frames, but your prescription must be within our current manufacturing capabilities. If you want to find out if we can make your prescription, email us at email@example.com. If your prescription power is complex or has a very high power, we’ll contact you to discuss your options.
Single Vision vs Progressive lenses
Single vision prescriptions are the most common type of prescription. Single vision prescriptions have the same power over the whole lens. Progressive prescription lenses have a continuous change of power across the lens which enables you to see clearly at far, intermediate and near distances simultaneously.
Bifocal lenses have two distinct regions of different power, enabling you to see both far and near. The two regions are separated by a line.
EnChroma lenses are made with a blended bifocal which has a “soft” edge instead of the hard line of a conventional bifocal. Our blended bifocals are made on the same equipment that makes progressive lenses.
To order either a bifocal prescription, select the Progressive Lens option.
Prescription manufacturing time
Please allow 3-4 weeks for prescription orders to be made. Processing time may vary.