Glasses Prescription Scan via Screen Patterns | Generated by AI

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Question: How does the Framery DEV iOS app measure the prescription of eyeglasses using a laptop, a card, eyeglasses, computer graphics, etc.?

Answer:

The app referred to is “The Framery” on iOS (App Store ID 1153638659), formerly known as GlassesOn (developed by 6over6, now rebranded under 1-800 Contacts/The Framery). It is not related to the “Framery” office pod company. The “DEV” likely refers to its development origins or an older/test name, but the current public app is “The Framery.”

The app measures your eyeglass prescription (Rx values: sphere/power, cylinder/astigmatism, axis) by scanning your current pair of eyeglasses using computer vision and graphics techniques on your iPhone camera. It does not use a laptop directly (the process is mobile-only via the app), but the prescription extraction specifically requires holding your glasses up to a flat computer screen (laptop or monitor, sized 12”–27”) displaying specific patterns or graphics generated by the app.

How the prescription measurement works (Rx scan):

• Requirements:
  • Your current pair of eyeglasses (the lenses you want to measure).
  • A standard credit-card-sized card with a magnetic strip (e.g., library card, club card; light-colored preferred for visibility; not necessarily a credit card).
  • A flat computer screen (laptop, desktop monitor, etc., 12–27 inches).
  • Good lighting and following on-screen/voice instructions.
• Process:
  1. Open the app and select the prescription/Rx scan feature.
  2. The app displays calibrated computer graphics/patterns (likely grids, dots, lines, or interference patterns) on your computer screen.
  3. Hold your eyeglasses in front of the screen so the lenses are aligned with the displayed patterns.
  4. Hold the magnetic strip card next to or in view (for scale/reference, as its known real-world size calibrates pixel-to-mm conversion in the image).
  5. The iPhone camera captures the view through the lenses, detecting distortions, refractions, or moiré patterns caused by the prescription lenses interacting with the screen graphics.
  6. Using computer vision algorithms (image processing, edge detection, pattern recognition, and optical calculations), the app analyzes how the lenses bend or alter the displayed graphics to compute the optical power parameters (sphere, cylinder, axis).
  7. The known size of the card provides absolute scale for accurate measurements (within ±0.25 diopters for Rx).

This method extracts key prescription values from single-vision lenses (accuracy: Rx within 0.25D, PD within 2 mm). It is FDA-listed, CE-marked, etc., but is not a substitute for a professional eye exam—it reads existing lenses only.

Separate but related: PD measurement

• PD (pupillary distance) uses only the phone camera + the same magnetic card (held above your eyebrows for scale).
• No laptop/screen needed for PD.
• It captures a photo/video of your face + card, uses computer vision to detect pupils and scale via the card’s known dimensions.

The laptop/screen + graphics are specifically for the prescription (Rx) extraction part, enabling lens power analysis via displayed test patterns.

References:

• The Framery on the App Store
• The Framery PD tool page (mentions card usage)
• App description mentioning screen for Rx scan

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