/ ˈɒptɪkl; NAmE ˈɑːp-/ adjective [ usually before noun ]
1.
connected with the sense of sight or the relationship between light and sight :
optical effects
2.
used to help you see sth more clearly :
optical aids
optical instruments such as microscopes and telescopes
3.
( computing ) using light for reading or storing information :
optical storage
an optical disk
► op·tic·al·ly / -kli; NAmE / adverb