Why do my eyes feel tired and strained?
Eye strain usually comes from sustained effort at a close task, often with an uncorrected or changed prescription, an unstable tear film, or prolonged focus without breaks. It is uncomfortable rather than damaging.
- Subject
- Vision problems
- Topic
- Blur, night vision & strain
- Kind of question
- Why…
- Last reviewed
- 22 September 2026
In more detail
The common pattern is that the eyes feel heavy and the vision goes soft after long screen or reading sessions, and it improves with rest. Persistent strain despite breaks is worth an eye examination, because the cause is sometimes a prescription that no longer fits.
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Where this answer sits
It is one of 483 answers in the vision and eye health knowledge base, filed under Vision problems & prescriptions in Blur, night vision & strain . The subject page carries the answers either side of it, and the hub is searchable.
This information is for educational purposes and does not replace an examination by a qualified eye-care professional.
General answers cannot tell you what is happening in your own eyes. Only an examination by a qualified ophthalmologist can do that.
Sources & further reading
We prefer primary sources. Where a claim comes from a manufacturer, a single study or a regulator, it is labelled as such below.
- EyeSmart: eye health information for the public
Patient-facing material from the largest ophthalmology professional body, covering conditions, tests and treatments outside refractive surgery.
Used for Cross-checking patient-facing explanations of non-refractive eye conditions; Describing what tests such as dilation and OCT involve.
Link checked 23 September 2026