- optical character reader
- optical character recognition
- optical computer
- optical disk
- optical fiber
- optical illusion
- optical isomer
- optical maser
- optical scanner
- optical tweezers
- optic axis
- optic chiasm
- optic chiasma
- optic cup
- optic disk
- optician
- opticians
- optic lobe
- optic nerve
- optic nerves
- optics
- optics
- optic vesicle
- optima
- optima