Plan screen breaks during study.
The widely used 20-20-20 guidance asks for a twenty-second look at something twenty feet away every twenty minutes, which relaxes the focusing muscle and restores blink rate. Across a seven-hour screen day that is twenty-one micro-breaks costing seven minutes in total — a trivial time cost. Longer breaks every couple of hours address posture and general fatigue rather than the eyes.
Break counts
Short breaks = floor(screen minutes / break interval); long breaks = floor(screen minutes / long break interval)
Time cost
Break minutes = short breaks x break seconds / 60 + long breaks x 5 minutes
General guidance only, not medical advice. Persistent sleep problems, eye strain, pain or anxiety should be discussed with a qualified professional.
It targets two real mechanisms — sustained accommodation of the focusing muscle and reduced blink rate causing dryness. Evidence for symptom relief is reasonable; it is not a treatment for underlying eye conditions.
Short eye breaks do not — looking into the distance is enough. Longer breaks are more useful standing and moving, since posture and circulation are the targets.