Perspicillum
Perspicillum, sive perspicilla (plurale tantum), sive vitra ocularia,  (npl), significant instrumentum videndi e duobus lentibus factum. Perspicillum hominibus usui est, qui male vident et quidem myopia aut presbyopia laborant. Perspicillum infuscatum, quod pro lentibus vitra obscurata habet, a luce nimia defendit.

Nexus interni
Lens inserticia
Ophthalmologia
Optica
Pince nez

Notae

Bibliographia
Collin, Liz. 2011. "Good Question: Why Do So Many Of Us Need Glasses?" CBS Minnesota, 22 Iunii 2011. Editio interretialis.
Ilardi, Vincent. 2007. Renaissance Vision from Spectacles to Telescopes. Philadelphiae American Philosophical Society. Google Books.
Needham, Joseph. 1962. Science and Civilisation in China. Cantabrigiae: Cambridge University Press. Google Books.

Nexus externi 

Instrumenta visifica
Ophthalmologia