We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. Last medically reviewed on August 5, 2017 Lazy eye: Treated with specific glasses, eye drops, vision therapy, and patches.Sometimes, doctors may recommend laser treatment and surgery. Retinal infection: Treated with an injection in the eye, and may require oral or intravenous drugs.Severe unilateral macular degeneration: Currently, there is no cure, but vision aids and treatment can help slow down progression.Surgery does not always improve vision, and if the retina cannot be reattached, a person will eventually go blind in that eye. The surgical procedure has an 80-90 percent success rate, although a second operation is sometimes needed. Retinal detachment: Can only be repaired with surgery, which is not possible in every case due to remaining scar tissue.Optic atrophy: Is irreversible, so treatment focuses on stopping its progression.An optic nerve tumor: Treated according to whether the tumor is benign or malignant (cancerous).Severe glaucoma: Treated with eye drops, laser treatment, or surgery, depending on the underlying cause.Pain can be managed with over-the-counter pain medication, if necessary. Optic neuritis: Treated with steroids but will often improve without any treatment.Some of the conditions that can cause Marcus Gunn pupil may be treated in the following ways: Therefore, treatment will depend on the cause of Marcus Gunn pupil. Marcus Gunn pupil is not treated directly, as it is a symptom of another issue. Share on Pinterest Eye drops are a common treatment option for Marcus Gunn pupil. The discovery can alert the doctor to an underlying condition. When a light is shone into an eye that has Marcus Gunn pupil, it will not constrict as much as an unaffected eye, signaling that there is a problem.Ī person is often unaware they have Marcus Gunn pupil until a doctor performs the swinging flashlight test. The doctor will hold the light in front of one eye for about 3 seconds and then move it to the other eye. The light test involves an eye doctor shining a bright and narrow beam of light into the eyes in a semi-darkened room. The efferent pathway: The message is sent back from the brain to the pupils via nerves, which causes the pupils to constrict.The afferent pathway: The pupil sends messages to the brain along the optic nerve.Pupils react to light being shone into them in this way because of the light reflex pathway, which is split into two parts: This is called consensual light reflex, and the test is commonly known as the Marcus Gunn test, or the “ swinging flashlight test.” When a light is shone into a normal functioning eye, both the left and right eyes should constrict equally, as they are linked.

Split pupil