What is the name of the normal defense reflex characterized by the upward and outward rotation of the globe following forced lid closure?

Study for the NBEO Ocular Physiology Exam. Utilize flashcards and multiple-choice questions to enhance your learning. Prepare effectively for your certification!

The normal defense reflex characterized by the upward and outward rotation of the globe following forced lid closure is known as Bell's phenomenon. This reflex occurs when the eyelids close, typically as a protective mechanism, causing the eyes to move in a specific direction. This movement serves to protect the cornea by positioning it in a way that reduces the risk of damage or exposure when the eyelids are shut.

During the lid closure, the activation of the extraocular muscles results in the upward and outward rotation of the eyeball. This reflex is particularly important in the context of protecting the eye from potential harm and maintaining proper eye health, as it ensures that the cornea is shielded from foreign objects and that the eyelids can effectively cover the eye for protection.

In contrast, the other choices refer to different reflexes: the corneal reflex involves blinking in response to corneal stimulation, the pupillary light reflex regulates the amount of light entering the eye, and the accommodative reflex is responsible for adjusting the eye's focus on near objects. Each of these plays a vital role in visual processing and eye protection but does not describe the specific reflex associated with the upward and outward movement of the eye during forced lid closure.

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