Visual Field
The entire field that any of the eyes can see when looking at a fixed point is called the "Field of Sight". The width of the visual field in a normal eye is 60º on the nasal side (nasal), 70º below, 50º above and 90º at the ear side (temporal). Since there is no blocking structure on the outer side of the eye, the widest part of our visual field is the side where our ears are located.
Computerized Visual Field Test
Field of view means everything you see. The Computer Vision Field test evaluates both straight forward focused vision (central) and side vision (peripheral). This test is important in the diagnosis of many retinal and neurological eye diseases, especially glaucoma (eye pressure). Glaucoma is an eye disease that is usually caused by increased pressure inside the eye and can cause slow, painless and permanent vision loss. During the test, computerized tools are used to plot the visual field of the expert performing the test. Pupils are not dilated to perform this test. The test takes about 10-20 minutes per eye. Visual Field Test is also called “Perimetry”.
Visual Field Defects (Losses): Different types of visual field defects occur in various problems that occur in the visual pathways. If we examine Figure 4.5; In case of a disturbance in the right optic nerve, vision in the right eye will be completely lost and visual field defect no. 1 will appear, while left eye vision will be normal.
In the right optic tract lesion, the patient will not be able to see the inner part of the visual field with the right eye and the outer part with the left eye, since the outer retinal fibers of the right eye and the inner retinal fibers of the left eye will be affected. In this case, visual field defect no. 3 occurs. In diseases in which the visual pathways are affected, the patient may complain of decreased vision and loss of vision. In such cases, as in cases of vision loss caused by diseases of other parts of the eye, refractive correction methods are of no use.
* The content of the page is for informational purposes only, please consult your doctor for diagnosis and treatment.
