Color Blind Test & Vision Simulator

A lightweight, privacy-focused, single-page web application that allows users to screen for color vision deficiencies using official Ishihara plates and simulate color blindness on uploaded images.

🚀 Live Demo: https://heretool.com/color-blind-test

🛠️ Features

• Ishihara Plate Test: Covers 10 standard test groups (plates 1-10) to screen for red-green and total color blindness.
• Real-time Color Blindness Simulator: Allows users to upload any image locally and view it through the eyes of someone with Deuteranopia, Protanopia, or Achromatopsia.
• 100% Privacy & Local Processing: No database, no backend. Image processing and simulation are performed purely client-side using the HTML5 Canvas API and SVG filters.
• High Performance: Built with pure static HTML, modern CSS grid layout, and vanilla JavaScript. Zero dependencies.

📦 File Structure

├── index.html          # Main application file (HTML, CSS, and JS combined)
├── LICENSE             # MIT Open Source License
├── README.md           # Project documentation
└── ishihara/           # (Required) Directory for Ishihara test plates (1.webp - 10.webp)