Biconvex used in a sentence

Biconvex in a sentence as an adjective

And they were lenses - proper biconvex lenses - not push-buttons.

The surplus shed website has double convex as a separate search option as biconvex, but wikipedia says they're the same thing?

* Lenses: at best you'll get off-the-shelf biconvex, but more commonly terrible planoconvex lenses.

First off, I am very hesitant to say anything about biconvex problems - I only see them in passing and they are definitely not in my wheelhouse.

If someone has more knowledge about this I'd really like to know if they're at least "close enough" to use, since I couldn't find any biconvex lenses on the website of the correct parameters.