Reasons for Digital Eye Strain: Back Lit Screens
Hippus is the normal involuntary small rhythmic pulses (dilation/constriction) of the pupil. The frequency and size of hippus movements are influenced by light.
There is a school of thought that backlit screens cause more fatigue and strain because they induce more intense hippus movements. This would be why many people enjoy reading more on paper or e-readers vs. tablets/laptops/phones. There is not much research on this topic to make recommendations.
A recent patient of mine came up with this perfect description for the way her eyelids felt... Gritchy.
What did she mean and what causes this?
I wonder if this eye drop is still ok?
Scenario: you dig an eye drop bottle from deep in your travel bag. Expiration date on the worn label is next month .. is this drop still ok to put in your eye?
Do you blink to clear?
I suggest that clinically I see many patients mis-attribute transient screen blur to their glasses. This is most likely dry eye and counseling on drop use is usually met with some skepticism!