[1] Tunnel vision can be caused by: Eyeglass users experience tunnel vision to varying degrees due to the corrective lens only providing a small area of proper focus, with the rest of the field of view beyond the lenses being unfocused and blurry.

[citation needed] Binoculars, telescopes, and microscopes induce an experience of extreme tunnel vision due to the design of the optical components.

A wide field microscope or telescope generally requires much larger diameter and thicker lenses, or complex parabolic mirror assemblies, either of which results in significantly greater cost for construction of the optical device.

Central vision refers to the range people see that's straight ahead of them, and it's characterized with fine details and better ability to detect color.

Then the liquid goes past the pupil to arrive at the anterior chamber, the space between iris and cornea, and eventually goes out of the eye through the connective tissue called trabecular meshwork.

[13] In addition, compared to individuals without field defects, people with impaired peripheral visual require longer search time, more fixations with shorter durations, and more errors while driving, influencing their ability to maintain a steady lane and increasing their risks of collision.

[13] In people with glaucoma, the size of their visual span is limited due to the loss of peripheral vision, and the number of words they can see is also less.

The peripheral visual field is associated with magnocellular pathways, processing low spatial frequency information, which encompasses broad details, and the central visual field is linked with parvocellular pathways, responsible for the high spatial frequency information, which captures finer details within a scene.

Although central vision loss is linked with impaired face recognition ability, and little research has focused on face recognition in peripheral vision, a review article mentioned increases in activity in the ventral occipital temporal cortex on fMRI when a facial image is presented in the ipsilateral peripheral visual field, indicating the peripheral vision may play a more important role in face recognition than previously believed.

[13] Furthermore, studies examined that Glaucoma patients, who have peripheral vision loss, need shorter distance to recognize faces and gender.