A man works at a screen all day and his eyes feel gritty and tired by the afternoon. He buys blue light filtering lenses.
They make little difference, because his problem is that he blinks a fraction as often as usual while concentrating, his office is air conditioned and he has an uncorrected small prescription that is making his eyes work harder.
All three are treatable. He bought the thing that was marketed to him rather than the thing that was wrong, because nobody assessed it.
Myth: screens damage your eyes
Reality is that there is no good evidence of lasting damage from normal use. What screens reliably cause is discomfort, which is real, treatable and different from damage.
Reality: blinking is the main mechanism
Blink rate falls substantially during concentrated screen work, which leaves the surface of the eye inadequately covered and produces exactly the gritty tired sensation people describe.
Myth: blue light is the problem
Reality is that the evidence for the marketed claims is thin, and the measures that help are unglamorous and effective rather than a coating on a lens.
Reality: an uncorrected prescription makes it worse
Even a small uncorrected error means sustained effort to maintain focus. This is the most commonly missed cause and it is found by a test rather than a purchase.
Myth: dry eye is a minor irritation
Reality is that it can significantly affect comfort and vision, it is very common, and it is substantially underdiagnosed because people assume it is simply how eyes feel.
Reality: dry eye has more than one cause
Insufficient tear production and poor tear quality from the oil glands are different problems with different treatments, which is why assessment matters before buying drops.
Myth: any eye drops will do
Reality is that products differ considerably, preservatives matter for frequent use, and the right choice depends on which mechanism is involved.
Reality: the environment matters
Air conditioning, heating, fans and low humidity all accelerate evaporation, and adjusting these frequently helps more than anything bought.
Myth: you should take a break every so often
Reality is that a specific structured habit works and a vague intention does not. A regular deliberate pause looking into the distance, done consistently, is the effective version.
Reality: screen position and lighting matter
Slightly below eye level reduces the exposed surface, and glare from windows or overhead lighting adds effort that people do not notice they are making.
Myth: it will resolve on its own
Reality is that for many people it becomes chronic, and untreated dry eye can affect the eye surface, which is why persistent symptoms deserve an assessment.
Reality: contact lens wearers need specific advice
Screen work and lens wear together increase dryness, and the management is different, which is worth raising before somebody simply stops wearing lenses.
Reality: an assessment costs less than the products people buy
A proper examination identifies which mechanism is involved and what will actually help, which is what makes the spending purposeful rather than hopeful.
Answer the screen question properly before selling anything
An assistant that asks about symptoms, hours at a screen, environment, current prescription and what has already been tried can explain what is likely happening and book an assessment, rather than recommending a filter for a dryness problem. The same open explanation appears in how financial advisors use chatbots to answer client questions, alongside eye test frequency and entitlement questions, the booking load in eye test booking questions opticians hear daily, and the same practical aftercare pattern in drying time and room access questions after cleaning. See pricing, run the numbers on the chatbot ROI calculator, and the sector view sits under opticians.