OpticalApp

The future of accessible

AI-assisted eye screening on your phone, with a DIY adapter made from cardboard or 3D-printed parts.

EfficientNet-B0 • RFMiD • On-device TFLite • Multilingual
Download APK Watch Demo View on GitHub

Bridging the Gap in Eye Care

The Problem

Prohibitive Cost

Professional fundus cameras cost thousands of dollars, out of reach for many communities.

Limited Access

Specialists are concentrated in cities, leaving rural and low-income areas without access to check-ups.

Late Detection

Many of the 28 detectable diseases are silent until the damage is irreversible.

Our Solution

Radically Low Cost

An adapter anyone can build for under $8 USD, democratizing the hardware.

AI in Your Pocket

The app analyzes images without needing internet, bringing diagnostics anywhere.

Early Detection for All

Enables mass preventive screenings to refer cases in time and save sight.

Simple Interface, Powerful Results

OpticalApp screenshot showing a healthy fundus analysis.
OpticalApp screenshot showing an anomalous fundus analysis.

Offline TensorFlow Lite. Multilingual UI (EN/ES/FR). Text-to-Speech guidance.

See It In Action

Build Your Own Adapter

Materials

  • Magnifying-glass lens (~18–25 mm Ø) or 20D ophthalmic lens
  • Cardboard tube (e.g., from paper towels)
  • Black electrical tape
  • Scissors or utility knife
  • Optional: Old phone case for stable mounting

Steps

  1. Mount lens at one end of the tube.
  2. Align phone camera with the other end.
  3. Use phone flash for illumination (diffuse with matte tape).
  4. Block light leaks with black tape.
  5. Adjust phone-to-lens distance to focus.
Photo of the cardboard prototype
Cost: ~$1 USD

Lighting: uses phone flash or external lamp.

Assembly

  • 3D print semi.stl. Parametric SCAD in repo.
  • Insert LED through side hole; add diffuser cap.
  • Glue slide switch at top base side.
  • Glue battery holder under the base.
  • Route wires through pass-through holes.

Wiring

(+) battery → switch → (+ LED)

(−) battery → (−) LED

Photo of the 3D printed prototype
Cost: ~$8 USD

Note: See schematic tab for circuit details.

Electrical schematic for the 3D-printed adapter's LED circuit.

This circuit applies only to Option B (3D-Printed) for internal illumination.

Explore the 3D Model

Download .STL

Loading 3D model...

Rotate: drag • Pan: right-drag • Zoom: wheel

Project Insights

Lens Trade-offs: 20D vs. Magnifying Glass

Magnifying Glass Lens

  • Pro: Extremely accessible and low-cost.
  • Pro: Good enough for basic fundus visualization.
  • Con: Variable quality and optical aberrations.

20D Ophthalmic Lens

  • Pro: High optical quality, designed for the task.
  • Con: Higher cost and less available.
  • Con: Requires more precise alignment.

Our approach: Default to the accessible magnifying glass, but provide a parametric 3D model for those with access to 20D lenses.

Feature Professional Fundus Camera Smartphone Adapters OpticalApp DIY
Cost $5,000 - $25,000+ $300 - $1,500 <$1 - $8
Portability Low (Desktop) High Extremely High
AI Analysis Often cloud-based Varies / App-dependent On-device, Offline
Openness Proprietary Proprietary Fully Open Source

Option A: Cardboard

~$1 USD

Ultra-low-cost and built with household materials. Maximum accessibility.

Option B: 3D-Printed

~$8 USD

More robust, includes integrated lighting for consistent results.

Join the Mission

Help us bring AI-assisted eye screening to more communities. Download the app, build an adapter, and contribute to the future of accessible healthcare.

Download APK Watch Demo

Disclaimer: OpticalApp is intended for educational and screening pilot purposes and is not a certified medical device.