ἀτένισις
From LSJ
ἀγεωμέτρητος μηδεὶς εἰσίτω → no one ignorant of geometry may enter, let no one ignorant of geometry enter, let no one ignorant of geometry come in
English (LSJ)
εως, ἡ, straining of the eyesight, Paul.Aeg.6.21.
Spanish (DGE)
-εως, ἡ fijación de la mirada βιαία Paul.Aeg.6.21.