20-20-20 rule

The 20-20-20 rule is designed to be an easy to remember caution about doing too much near work and to give your eyes a break from eye strain regularly. This rule is supported by conventional optometry and is a start towards the EM method.

• Every 20 minutes
• Look at something 20 feet away (6 meters)
• For at least 20 Seconds

Endmyopia recommends even more breaks.

• Every 20 minutes, take a 5 minute break.

• Every 3 hours, take the longest break you can (half hour to hour) (3 hour rule)
• Take your break outside.
• As you develop Strain Awareness you can customize your break schedule to your needs.

One more thing

The most commonly asked question about the 20-20-20 rule is: "Do I need to switch back to [normalized] every time I shift focus, for a break?"

The answer is: whatever you wish. However, it would make your life easier if you kept the focal plane you are already using, be it differentials or nothing depending on where you are in your journey, for breaks under 5 minutes. If you are taking a much recommended longer break; this is a good time to switch to normalized, in order to ensure you are not trading close up strain for excessive blur strain.

Reverse 20-20-20 rule

Which glasses should you wear if you don't want to change your glasses all the time?

At least two people in the Discord chat have the following personal rule: If you will be in blur for more than 20 minutes, change to your other pair of glasses.