Czech to English Medical Medical (general) Eye medicine

In Czech medical report, in section headed M nn.: (please see my other question on this abbreviation):

"Štěrbiny sym., bulby ve středním postavení, volně pohyblivé všemi směry."

I know that štěrbina normally means slot, but wanted to know what English for "oční štěrbiny" is. The word "oční" is not in my document but I found it often used in Czech google.

Thanks!

Stephen