External Ocular Axis

The external ocular axis is one of the most important concepts in ophthalmology. This concept describes the location of the eye within the orbit and the angle at which it is located relative to the face. This article will help you understand what the external ocular axis is, what features it has and how it is related to the visual axis.

The external ocular axis is a line that runs from the center of the limbus (the outer part of the cornea) posteriorly through the outer edge of the iris and then through the pupil to the anterior wall of the eyeball. It ensures the correct curvature of the lens in the eye and allows the image to be clearly focused on the retina.

One of the key features of the external ocular axis is that it is completely symmetrical. This means that both eyes are positioned at the same point, and the angle between the eye and the face does not differ depending on the side of the face you are looking at. This is very important for the brain to correctly interpret visual information, and it also determines eye movements, such as when you move your gaze from one object to another.

However, disruption of the external ocular axis can lead to various eye diseases, such as entropion, hidden strabismus, optic nerve atrophy and many others. For example, if the anatomy of the eyeball or the formation of a bursa of the upper eyelid is disrupted (because it is attached to the subcutaneous fat above it), then this can cause entropion of the upper eyelid, which affects the ability of the eye to see.

The external ocular axis is one of the most important parameters of vision, which determines the correctness of a person’s perception of the surrounding world. The ocular axis is the line that connects the center of the pupil of each eye to the center of the retina, or, in other words, the center of the macula. In order to accurately determine the external ocular axis, it is necessary to perform a special test known as ophthalmic refraction. This method allows you to measure the angle at which the ocular axes are located and calculate the distance between these axes. It is also necessary to clarify the location of the eyeballs, the rotation of the head, the width of the palpebral fissure, etc., in order to obtain a more accurate result. Disruption of the external ocular axis can lead to visual impairment, which is why it is important to know the optimal angle of vision for your own safety. To correct vision, correction of contact lenses or glasses is sometimes used, which allows you to change the angle of vision and make it more correct. However, before choosing such correction methods, it is necessary to conduct special tests. The wrong choice of glasses and contact lenses, especially if you use ones that have not been tested, can lead to vision impairment. You should contact professional ophthalmologists to check the correct angle of the ocular axis when choosing a vision correction method. To prevent possible vision problems, it is necessary to carry out regular visual tests and wear sunglasses with UV protection during all activities.