| Subject | English | Estonian |
| chem. | corrected optical density | korrigeeritud optiline neelduvus |
| chem. | corrected optical density | korrigeeritud neelduvus |
| commun., IT, industr. | fibre-optic network | kiudoptiline võrk |
| chem. | inductively coupled plasma optical emission spectrometry | induktiivsidestunud plasma aatomiemissioonspektromeetria |
| comp., MS | optical character recognition | optiline märgituvastus (A method of translating images of printed text into machine-encoded text) |
| comp., MS | optical character recognition | optiline märgituvastus (A method of translating images of printed text into machine-encoded text) |
| comp., MS | optical character recognition line | optilise märgituvastuse rida (A line of characters that is read by special character recognition equipment and translated into computer text) |
| phys.sc. | optical density | optiline tihedus |
| transp., tech., law | optical deviation | optiline kõrvalekalle |
| tech., law, chem. | optical distortion | optiline moonutus |
| transp., tech., law | optical distortion test | optilise moonutuse katse |
| phys.sc., chem. | optical index | murdumisnäitaja |
| econ. | optical industry | optikatööstus |
| econ. | optical medium | optiline andmekandja |
| transp., tech., law | optical qualities | optilised omadused |
| el. | optical sound track | optiline heliriba |
| transp., mil., grnd.forc., mech.eng. | optical tell-tale | märgulamp |
| transp., tech., law | optical unit | latern |
| chem. | specific optical density | optiline erineelduvus |
| chem. | specific optical density | erineelduvus |
| chem. | specific optical rotation | eripöörang |
| chem. | total optical rotation | optiline kogupööre |
