Announcement
Achievement fix
Finally, completionists can attain the ARPH achievement, if they know how.
Read announcementSteam
An Eye for Optical Theory 1666
Also known as An Eye for Optical Theory 1666, aefot1, an eye for optical theory 1666
An Eye for Optical Theory 1666 is a short point & click horror adventure game with a focus on atmosphere and narrative. It is the plague year of 1666 and Isaac Newton, in lockdown at his home, has been thinking on the topic of Optics, and planning a series of experiments. Will you help him?
Last update
2 Jun 2026
Players now
0
Latest update
Update history
Browse past updates and patch notes for this game.
1 updates
No updates match those filters.
New updates will show up here as they ship.
Gallery
In-game media
Achievements
Community progression
Top picks from 6 Steam achievements, sorted by player unlock rates.
- The Experiment BeginsStart the Experiment88.9%
- The SpectrumComplete the game83.4%
- The spectrumObserve the spectrum79.2%
- Whyfor I do not knowPoke the other eye67.7%
- Newton CompleteFully realize the Experiment53.4%
- A Research Person (Honest)Hear every line of dialogue14.7%