Men who take drugs like か まぐ ら 100 通販, Cialis and Levitra are at risk of vision loss, according to a study. Researchers have linked the common ED drugs to serious eye conditions, including ischemic optic neuropathy, retinal vascular occlusion and retinal detachment. Symptoms include blurry vision, light sensitivity and loss of color vision. While other side effects have been reported before, this is the first large epidemiological study to link the drugs with these conditions.

Ischemic Optic Neuropathy

Ischemic optic neuropathy happens when a blood flow problem shuts off oxygen to the optic nerve. It can result in vision loss or blindness. The condition can cause both central or detailed vision, as well as side (peripheral) vision to disappear. It’s not curable, but if treated quickly enough it can limit the amount of vision lost. Symptoms of the condition include sudden, painless, unilateral loss of vision in the affected eye, a visual field defect, a swollen optic disc, and flame-shaped peripapillary retinal hemorrhages.

Ischemia can occur from an injury or disease, and it can also be a side effect of some medications. The medications can lead to ischemic optic neuropathy when they raise blood pressure too much, or they can block the flow of blood to the brain and eyes. Other risk factors of this condition are high cholesterol, glaucoma, sleep apnea, or the sickle cell trait.

In the case of erectile dysfunction drugs, the problem seems to be with the way they affect blood flow to the eyes. Some studies and isolated case reports have linked the use of Viagra (sildenafil), Cialis (tadalafil), and Levitra (vardenafil) to serious vision-related side effects, including ischemic optic neuropathy and retinal detachment.

Retinal Vascular Occlusion

A blockage in a retinal blood vessel can cause vision loss. It is not uncommon for both eyes to be affected. This is because arteries and veins run very close together at the back of the eye, and sometimes one can cause the other to become blocked. This can be caused by atherosclerosis, but may also be due to infection or inflammation of the retina. If the condition is not treated, it can lead to permanent vision loss.

The most common type of retinal vascular occlusion is called a branch retinal vein occlusion. It occurs when the blood vessels at the back of the eye are occluded by a blood clot, which causes fluid to leak from the damaged vein and collect in the area of the retina called the macula. This can cause problems with central vision, making it difficult to see faces and objects that are straight ahead of you. It is most commonly seen in patients over the age of 50, but people in their 20's can get it too.

Retinal Detachment

The retina is a thin layer of tissue that lines the back of the eye. It sends messages to the brain that help form vision. If the retina detaches, it stops sending messages to the brain and you can lose your vision.

A detached retina is a medical emergency and requires prompt treatment to prevent permanent blindness. The symptoms of a retinal detachment are floaters, flashes of light, or a dark curtain in the center of the visual field that can progress toward or involve the center of the eye (the macula).

About 3 out of 100 people experience a retinal detachment over a lifetime. Usually, it is triggered by what start out as normal changes in the fluid that fills the eye (the vitreous). This fluid can pull on the retina and cause a retinal tear. Then, fluid can seep behind the retina and separate it from the blood vessels that supply oxygen and nourishment to the eye. This is called a rhegmatogenous retinal detachment. On the off chance that you are searching for a better ED arrangement, you should attempt カマグラ ゴールド.

NAION

Although very rare, a condition called Nonarteritic Anterior Ischemic Optic Neuropathy (NAION) has been linked to the use of PDE5 inhibitor drugs. This disease causes sudden painless vision loss in one eye which is characterized by gray or dark spots that don’t move, severe blurs, or complete blindness. It is thought that this disease results from a drop in blood pressure at night reducing the supply of blood to the optic nerve where it exits the back of the eye. Other risk factors include cardiovascular disease, obstructive sleep apnea, and diabetes.

The optic nerve receives its blood supply from small branches of the ophthalmic artery that come off the carotid arteries. If those small branches are lost, the front part of the optic nerve swells from lack of blood flow and causes the eye to lose vision. The damage eventually goes away, but some of the nerve fibers are permanently damaged and you may lose some visual function.