After nearly a decade wearing glasses for myopia and astigmatism, a developer built a VS Code extension to address the daily frustration of generic editor settings. The tool, called Harmonia Vision, started as a personal project to make long coding sessions more comfortable for his own eyes.

The extension uses a calibration engine that considers specific vision conditions and prescription values to recommend optimal font size, letter spacing, and line height. Unlike manual tweaking, it provides data-driven adjustments that account for how conditions like astigmatism cause character blur and how myopia affects viewing distance.

The tool features a safe apply workflow with automatic snapshots and one-click reverts, addressing the trial-and-error process many developers endure. It’s entirely local, with no data sent to servers, and is now available on the VS Code Marketplace as an open-source project aimed at improving coding comfort for developers with vision needs.