This depends not only on habit but also on the specifics of your visual system. The ideal distance is the Harmon distance.

📏 What is the Harmon distance?

It is the distance from the eyes to an object (a book, notebook, or screen) at which the eyes work comfortably without strain. Determining it is simple:

➡️ Place three fingers together;

➡️ Touch them to the outer corner of your eye;

➡️ Extend your arm to your elbow—that's the Harmon distance.

🧠 This distance takes into account individual anatomical features—people with greater height and longer arms will have a larger distance.

👁 At this distance:

✅ Accommodation (focus) strain is reduced;

✅ Eyes fatigue less;

✅ The risk of developing myopia in children and teenagers decreases.

💡 Use the Harmon distance for reading, writing, and viewing a smartphone—your eyes will "THANK YOU"!