Players now
0
newvs 24h ago · updates every minute
Last 7 days
Screenshots, achievements, specs, every price change and sale we've seen on Steam, and trading cards.
Loading from Steam…
Steam prices for United States (change the country in the top bar), and Steam keys from authorized stores.
Checking other stores…
Loading from Steam…
93% positive of 16 · Positive · Live from Steam
Loading reviews from Steam…
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?
Live data from Steam, tracked by SteamPlayerBase.
What changed on Steam for this game since we started following it: prices and sales, builds, name, release date and review score.
Review score: 93% on 2026-11-01 → 93% today (16 reviews)
No authorized Steam key store lists this game right now.
Games we track that share the most Steam tags with this one.
Not tested by Valve yet. Results from Valve's own testing.
Valve hasn't published test details for this game.
Every build released on Steam for this game since we started tracking it, with the developer's patch notes. Updated within minutes of each new build.
Finally, completionists can attain the ARPH achievement, if they know how.