Visisipy

Visisipy (pronounced like “Mississippi”, but with a V) is a Python library for optical simulations of the eye. It provides a uniform, backend-agnostic interface to define and build eye models, including ready-to-use models such as the Navarro eye, and to run common clinically relevant analyses on them, such as off-axis refraction calculations, without requiring in-depth knowledge of the underlying ray-tracing engine. A simplified version of Visisipy can even be run directly from your browser.

Visisipy follows four design goals: a uniform interface to define, build and analyse different types of eye models using clinically relevant abstractions; a growing collection of ready-to-use models, such as the Navarro and Gullstrand eyes, that can be customised as needed; accessible, one-line analyses for clinically relevant outcomes; and a modular design that supports multiple ray-tracing backends, both commercial (OpticStudio, through ZOSPy) and open-source (Optiland)). The project is developed as a community-driven effort by the MReye group, and welcomes contributions and suggestions for new models or analyses through GitHub discussions.

License

MIT

Last updated

Jul 1, 2026

Requires Python

>=3.10, <3.14

Dependencies

• matplotlib
• numba >=0.60.0
• numpy
• optiland >=0.6.0,<0.7.0
• scipy
• typing-extensions >=4.12.2 (only if python_full_version < '3.13')
• zospy >=2.1.2 (only if sys_platform == 'win32')