Blue light filter

What does the filter actually do?

The filter acts on the light passing through the lens; it does not, on its own, correct a visual impairment, nor does it replace the correct prescription. It may be incorporated into the material or applied as a surface treatment. The product data sheet provides details of the filtered range, transmission and any residual colour cast.

Digital comfort: no one-size-fits-all promises

The available evidence does not show that lenses with a blue light filter generally reduce computer vision syndrome compared with lenses without such a filter. Some people may prefer the way they look, whilst others may not: for this reason, we do not consider them an essential treatment for anyone who uses digital devices.

When using computers and smartphones, the most important factors are appropriate optical correction, viewing distance, posture, lighting, taking breaks and managing the amount of time spent working at close range. When work involves a range of viewing distances, it may be more important to consider the geometry of the lens; for example, a solution office, rather than focusing solely on the filter.

How we assess this at Isolani Opticians

We compare the actual characteristics of the treatments – such as transparency, residual reflections and chromatic effect – whilst clearly explaining what the lens does and what it cannot promise. The choice is incorporated into the overall design of the spectacles, alongside the prescription, material, anti-reflective coating, geometry and usage patterns.

The Simulation Room can be useful when comparing options for work, study and everything in between; subjective perceptions are taken on board without turning them into a clinical promise.

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