Astigmatism

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances.

Excerpt from the Wikipedia article “Astigmatism (optical systems)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sebastian Kosch (Ginger Penguin), CC BY-SA 3.0, via Wikimedia Commons.