The Tono-Pen is a handheld device thatâs shaped like a large marker. It provides a digital readout of eye pressure. Your doctor can use it to touch your eye and measure pressure. Though useful in many cases, the Tono-Pen is considered less accurate than the Goldmann tonometer in people with normal corneas.
The English language has two types: British English and American English. Other variations such as Oxford English, Standard English, or other variants are mere adaptations of the two types (especially for consistency or reference use, e.g., in media or publication). British English.
For a particular language, this information is provided by a grammar, which systematically pairs forms with meanings, ambiguous forms with more than one meaning (see MEANING and SEMANTICS). There are two types of ambiguity, lexical and structural. Lexical ambiguity is by far the more common.