How many FPS can the human eye see?

A small light flickering in place looked steady at 34 to 61 Hz, depending on the person, in a 2024 Trinity College Dublin study. Flicker artifacts have been reported at 500 Hz, and eyes sweeping across a flickering light can catch it at thousands of hertz. Gamers in a 2026 NVIDIA study could reliably tell 60 Hz from 360 Hz, but not 144 Hz from 360 Hz.

Each of these is the limit of one task, measured in a small group. On an ordinary monitor, a higher refresh rate changes how far moving objects blur.

Flicker fusion

Flicker fusion is the rate at which a light switching on and off starts to look steady. Cho and colleagues take 50 Hz as the typical threshold. The speed of sight, a 2024 PLOS ONE study from Trinity College Dublin, tested 88 people aged 18 to 35 on a small white LED about 16 cm away, shielded from room light. Thresholds ran from 34.1 to 60.7 Hz, with a mean of 49.6 Hz. For the 49 who repeated the test in three sessions, about 80% of the variance came from differences between people and about 10% from session to session.

In From eyes’ microtremors to critical flicker fusion, a 2025 PLOS ONE study, 81 adults watched two white crosses on a 360 Hz monitor, one of them flickering at 30, 60 or 120 Hz. All but 1 spotted the flicker at 30 Hz, about half at 60 Hz and about 30% at 120 Hz, a rate the authors note is above the thresholds usually reported.

Artifacts past 500 Hz

The 500 Hz figure is the title of a 2015 Scientific Reports study, Humans perceive flicker artifacts at 500 Hz. Cho and colleagues cite it in 2025, with other work, as evidence that flicker and motion blur from low refresh rates make the picture look worse and can cause discomfort.

Flicker far above fusion rates shows up when the eyes move. Tan and colleagues at Pacific Northwest National Laboratory call this the phantom array, in a 2024 paper. You see a row of repeated images of a light when your eyes jump across it in large saccades while it flickers at 80 to 20,000 Hz. Below 80 Hz, a steady gaze sees plain flicker instead. The earlier studies the paper summarizes report average thresholds of 1,980 Hz in one, with a slit of light in a dark room, and about 10,000 Hz in another. These numbers describe light that switches on and off, not the frames of a game.

Telling refresh rates apart

In a 2026 paper from NVIDIA and the University of Limerick, Toth and colleagues had 101 gamers play a custom shooter task at 60, 144 and 360 Hz and judge how smooth each change looked. Corrected for response bias, they reliably told large gaps apart, such as 60 against 360 Hz, but not small ones, such as 144 against 360 Hz. Accuracy and speed improved above 60 Hz but did not differ significantly between 144 and 360 Hz. The authors name 144 Hz as a possible point of marginal returns.

In a 2024 preprint by Qin and Zhu, not peer reviewed, 26 players repeated a one-minute shooting task from a commercial FPS game platform. They played on an Alienware gaming laptop with a 1080p, 240 Hz screen set to 30, 60, 120, 144 and 240 Hz. Score, accuracy and self-ratings were significantly worse only at 30 Hz. It measured performance, not perception, and it’s the only study here that tested both 144 and 240 Hz.

Attention matters too: in the Cho study, 80 students did a task while a small red dot circled in a second window at the edge of their view. When the dot dropped from 180 Hz to 30 or 20 Hz for 30 seconds, only 8 of them reported anything odd, and only 1 described the change. Side by side afterwards, all 40 in the 20 Hz group saw the difference, but only 57.5% of the 30 Hz group.

30, 60, 144 and 240 Hz

A monitor with no strobe mode on keeps each frame on screen until the next one replaces it. Its frames don’t flash, so flicker fusion doesn’t limit it. Refresh rate changes how long each frame is held: 33.33 ms at 30 Hz, 16.67 at 60, 6.94 at 144 and 4.17 at 240. When your eyes follow a moving object, each held frame smears: at 960 px/s that is 32, 16, 6.7 and 4 px of persistence blur.

Each step up saves less. From 30 to 60 fps the hold time halves, and from 60 to 120 Hz it halves again. From 144 to 240 Hz each frame gets only 2.78 ms shorter. The panel matters as much as the rate: Blur Busters finds refresh rate steps far easier to see on an OLED, whose pixels change almost instantly, than on an LCD.

Past 240 Hz the gains keep shrinking: RTINGS finds 500 against 700 Hz harder to tell apart than 60 against 240 Hz, and names no exact rate where the differences stop.

A faster screen helps only when it runs at its full rate and the content keeps up. The refresh rate test checks your screen’s real rate, and the FPS test how many frames your computer gets. All comparisons runs six rates from 30 to 360 fps side by side on your screen.