Central position / central location / situated in the center. U vašoj rečenici može jednostavno: round, centered, reactive to light.

Centroponirana zenica znači da njen položaj ne odstupa više od 0,5 mm infranazalno od osovine. Svi ostali položaji se nazivaju korektopijom.

Corectopia is the displacement of the eye's pupil from its normal, central position.
https://en.wikipedia.org/wiki/Corectopia

Normally, the pupil is situated about 0.5 mm inferonasally from the center of the iris. Minor deviation up to 1.0 mm are usually cosmetically insignificant and should probably not be considered abnormal.
American Academy of Ophthalmology at https://www.aao.org/bcscsnippetdetail.aspx?id=1db0611a-6e30-...

Examination of pupil
- Number of pupil: one or more (polycoria)
- Location centric or eccentric
- Size: normal, mydriasis
Slide 66 at https://www.slideshare.net/GauriSShrestha/nursing-assessment...