Do you offer prescription glasses?
Yes. We offer single-vision prescription lenses, bifocal lenses, and progressive lenses for Thai domestic customers.
How do I order prescription glasses?
On the product page, select Add Prescription instead of Add to Cart. This opens a dedicated form where you can enter your prescription values, including SPH, CYL, AXIS, and PD (Pupillary Distance). When your order requires additional measurements or notes, please add them in the order notes field at checkout, or contact us through our OPHTUS LINE Official Account (@ophtus) referencing your order number. Customers may also visit our Siam Square store for complimentary prescription verification and consultation before placing an order.
What is Pupillary Distance (PD), and how do I measure it?
Pupillary Distance is the distance between the centers of your pupils, measured in millimeters. It ensures the optical centers of your lenses align correctly with your eyes.
To measure your PD at home:
1. Stand approximately 20 cm (8 inches) in front of a mirror.
2. Hold a millimeter ruler horizontally against your brow, looking straight ahead. 3. Close your right eye and align the ruler's "0" mark with the center of your left pupil.
4. Without moving the ruler, open your right eye and close your left.
5. The number aligned with the center of your right pupil is your PD.
The average adult PD is between 54 and 74 mm. For the most accurate measurement, we recommend asking your optometrist or visiting our Siam Square store.
My prescription is very strong. Can you fill it?
Yes. We do not impose a prescription strength limit. Strong prescriptions may require high-index lenses, which can extend production time by 7 to 14 business days.
What if my prescription is wrong or feels off?
There are two situations. If your lenses were made differently from the prescription you provided, this is a manufacturing defect and we will correct it at no cost — please refer to our Warranty page.
If your lenses were made correctly but you cannot adapt to them — for example, dizziness or headaches as your eyes adjust to a new prescription — we offer one complimentary lens exchange within 30 days of receipt, remade to your updated prescription in the same lens design. Visit our Siam Square store for a prescription check, or send us your updated prescription. If you prefer a more expensive lens, the difference in price applies. See the Complimentary 30-Day Exchange (Prescription Lens) on our Warranty page for full details.