TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
VERTEX SPHERE [1 record]
Record 1 - internal organization data 2023-05-16
Record 1, English
Record 1, Subject field(s)
- Orthoses
- Prostheses
- The Eye
Record 1, Main entry term, English
- vertex sphere
1, record 1, English, vertex%20sphere
correct, standardized
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
An imaginary spherical surface touching the back vertex. 1, record 1, English, - vertex%20sphere
Record number: 1, Textual support number: 1 OBS
The radius of curvature of the vertex sphere is the same as the steepest back optic zone radius, back central optic radius, or back vertex radius of an aspheric lens. 1, record 1, English, - vertex%20sphere
Record number: 1, Textual support number: 2 OBS
Glasses and contact lenses are considered to be either visual orthotic devices or visual prosthetic devices. 2, record 1, English, - vertex%20sphere
Record number: 1, Textual support number: 3 OBS
vertex sphere: term and definition standardized by the International Organization for Standardization (ISO). 3, record 1, English, - vertex%20sphere
Record 1, French
Record 1, Domaine(s)
- Orthèses
- Prothèses
- Oeil
Record 1, Main entry term, French
- sphère du sommet
1, record 1, French, sph%C3%A8re%20du%20sommet
correct, feminine noun, standardized
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Surface sphérique imaginaire touchant le sommet arrière. 1, record 1, French, - sph%C3%A8re%20du%20sommet
Record number: 1, Textual support number: 1 OBS
Le rayon de courbure de la sphère du sommet est identique au rayon de la zone optique postérieure, au rayon optique central postérieur ou au rayon de sommet arrière d'une lentille asphérique ayant la plus forte pente. 1, record 1, French, - sph%C3%A8re%20du%20sommet
Record number: 1, Textual support number: 2 OBS
Les lunettes et les lentilles de contact sont considérées comme étant soit des orthèses visuelles, soit des prothèses visuelles. 2, record 1, French, - sph%C3%A8re%20du%20sommet
Record number: 1, Textual support number: 3 OBS
sphère du sommet : terme et définition normalisés par l'Organisation internationale de normalisation (ISO). 3, record 1, French, - sph%C3%A8re%20du%20sommet
Record 1, Spanish
Record 1, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2025
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau
Features
Language Portal of Canada

Access a collection of Canadian resources on all aspects of English and French, including quizzes.
Writing tools

The Language Portal’s writing tools have a new look! Easy to consult, they give you access to a wealth of information that will help you write better in English and French.
Glossaries and vocabularies

Access Translation Bureau glossaries and vocabularies.
- Date Modified: