I’ve been trying out contact lenses for the first time. Multi-focal lenses provide different focal lengths to the eye at once, and you can have different prescription lenses in each eye (as long as they don’t differ by too much).<\/p>\n\n\n\n
This means the brain is getting signals from the eyes, each providing potentially multiple focal lengths, and learns to combine them to reduce blur. It’s interesting and I wanted to be able to visualise how that works, so I made this interactive simulator with the help of Gemini. It shows a heatmap (green is sharp, red is blurry) over distance, comparing uncorrected vision with modern multi-focal lenses. Try it out! All the calculations happen locally within your browser.<\/p>\n\n\n\n\n\n\n\n