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Sunglasses and lens filters

Sunglasses and lens filters: filter categories 0 to 4 with their transmittance bands, and the fact almost nobody knows: category 4 is not legal for driving…

This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.

What this guide covers

Filter categories 0 to 4 with their transmittance bands, and the fact almost nobody knows: category 4 is not legal for driving anywhere in the EU, while "UV400" says nothing at all about glare.

Item pages cover polarisation and where it helps or hurts, photochromic lenses behind a windscreen, whether cheap CE-marked sunglasses are dangerous, children's eyes and cumulative UV, glacier and ski glasses, lens tints for contrast in sport, prescription and clip-on options, coverage and fit, the published verdict on yellow night-driving lenses, and eclipse filters with the dates of the next eclipses visible from the Baltics. ~14 pages.

How to use it

Use Sunglasses and lens filters to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.

The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.

Search vocabulary in four languages

Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.

Evidence and provenance

The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.

Source: EN ISO 12312-1 and -2 scope abstracts, ICNIRP UV exposure limits (free), published trials on night-driving lenses (cited); eclipse dates computed from our own astronomy code. · checked 2026-09-09

Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.

Scope and boundaries

This guide owns the explanatory layer for the topic. Personal decisions, diagnoses, legal determinations and live availability remain with the relevant professional or official service.

Connected TempoLife guides

The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.

Why it belongs on TempoLife

/eyes, /sun, /drivers.

Frequently asked questions