The 20-20-20 rule and reminders to look away from your screen
After working at a computer until your eyes feel dry, many people think of the 20-20-20 rule: every 20 minutes, look about 20 feet away and pause for 20 seconds. Eye doctors often suggest this to people who look at screens for a long time, to ease eye strain. This piece starts from that rule, looks at why a literal reminder every 20 minutes is hard to keep up, and how Hina’s reminder works.
Where each of the three numbers lands
Twenty minutes is a stretch of continuous screen time. Twenty feet, about 6 meters, is how far you should look away from the display. Twenty seconds is how long you stay at that distance. All three numbers are about the eyes, not about whether a to-do got finished. The rule is for eye strain from staring a long time at a laptop, an external display, or a phone. It is an easy habit to remember, not a treatment. If your eyes stay uncomfortable, see a doctor.
In practice, look away from the screen at an object about 20 feet away, such as a distant building outside the window, for about 20 seconds before returning to your page, document, or code.
Why a popup every 20 minutes does not stick
If you turn the rule straight into a reminder, a timer sounds every 20 minutes, a line pops up in the menu bar, or a window covers the cursor you are typing with. The first few times you might look out the window and pause for 20 seconds. Then you are halfway through a config change, or a sentence of copy is not finished, and the popup arrives. You will usually close it first. After a while, you turn the reminder off as well.
The problem is not eye care itself. The interval does not match the work in front of you. A function, a page draft, or a call rarely wraps up right at the 20th minute. A reminder that lands in the middle of a sentence turns care into an interruption. The rule itself is not wrong. Forcing a popup every 20 minutes is just hard to keep up day to day.
So the same rule can stay in your head: after each paragraph you finish, or after each short meeting, look into the distance and pause. Or you can hand it to a less frequent reminder. The first depends on you remembering. The second depends on it showing up less often.
A small card only after a long time sitting
Hina stays in the macOS menu bar. Day to day it records apps you opened, how long each stretch lasted, and input counts. The care card does not follow the 20-minute beat. It looks at whether you have been sitting at the computer continuously for a long time, and only then shows a small card. It does not grab the cursor, so the text you are typing is not interrupted.
When the front window is full screen, or when the microphone is in use (for example, on a call), it waits first. It also does not appear while recording is paused, while you are Away, on the lock screen, or during sleep. In the daytime four cards take turns: Loosen your shoulders, Go refill your water, Take a short walk, and Look into the distance. In the evening the card becomes Step away from the screen, and late at night it is “It’s late. Get some rest”, with only a Got it button. At most three times a day. Three is a ceiling, not a count you are supposed to complete every day. On days when you have not sat long, none may appear.
This card does not stand in for the three numbers in 20-20-20. It does not appear on the dot at the 20th minute, and it does not push you to pause for a full 20 seconds. After you have been sitting continuously for a long time, one of its cards leaves a gap to look into the distance. Which building you look at, and how long you pause, is still up to you.
Whether you followed it is not recorded
The small card only reminds you to lift your gaze from the screen. Whether you looked about 20 feet away, and whether you paused for a full 20 seconds, Hina does not record. The card is not written to the database, does not appear in the daily report, and does not score the day with an eye-care completion rate.
Away on the Trail cannot prove you were resting your eyes either. It only means the keyboard and mouse had no input during that stretch. Only you know whether your eyes are tired. If the card feels unnecessary, you can turn it off in settings.