The most severe eye disease is Glaucoma, which is one of the most dangerous and worst eye diseases because Glaucoma also eventually causes permanent blindness that is irreversible with a "silent" progression that also shows no early pain or warning signs.
Glaucoma damages the optic nerve as a result of high fluid pressure inside your eye, which steals your side (peripheral) vision first before ending in total blindness.
Untreated diabetic retinopathy as well as aggressive eye cancers such as retinoblastoma also are the most severe eye diseases and threaten total loss of vision and even possible loss of life.
Also while there's no single eye disease that has never been cured, there are several chronic and progressive eye diseases and eye conditions that have no cure, which include glaucoma, age related macular degeneration or (AMD), retinitis pigmentosa and diabetic retinopathy.
Diabetic retinopathy is an eye disease that damages blood vessels in the retina.
Retinitis Pigmentosa is an eye disease that causes gradual breakdown of retinal cells.
AMD or Age Related Macular Degeneration is an eye disease that destroys sharp, central vision.
And Glaucoma is an eye disease that damages your optic nerve and leads to permanent vision loss.
Although these eye diseases and conditions cannot be cured completely, there are medical treatments that can help to slow down vision loss and manage symptoms, which include:
For Retinitis Pigmentosa, low vision aids and rehabilitation help people to maximize their remaining vision.
For diabetic retinopathy, blood sugar control, laser treatment and injections prevent further damage.
For AMD or Age Related macular Degeneration, special vitamin supplements, anti-VEGF injections, or laser treatments help to preserve remaining sight.
And for Glaucoma, eye drops, laser therapy or even surgery can be done to lower the pressure in the eye.
Also there are also several parasites that attack the eyes and the parasites that attack the eyes are commonly single celled amoebas as well as parasitic worms.
Several different kinds of parasites can attack and even infect the eyes.
Although the specific type of parasite that attacks or infects the eyes also depends on the infection as well as how it's contracted and where in the world you're located or the region of the world as different parasites affect different regions of the world.
Common eye parasites that attack and infect the eyes include demodex mites, toxoplasma gondii, Onchocerca volvulus, Loa loa (African Eye Worm) and Acanthamoeba.
Demodex mites are tiny microscopic mites, which live in your eyelash follicles and can also cause eyelid inflammation also known as "blepharitis" when overgrown.
Toxoplasma gondii, is a protozoan parasite, which can cause ocular toxoplasmosis, which leads to inner eye inflammation and even retinal damage.
Onchocerca volvulus, is a microscopic roundworm that is spread by blackflies and causes Onchocerciasis (river blindness).
Loa loa (African Eye Worm), is a thread like parasitic worm that is transmitted by deerflies in Central and West Africa and can visibly crawl across the surface of your eye.
And Acanthamoeba is a microscopic amoeba that causes Acanthamoeba Keratitis, which is a painful corneal infection that is also often linked to contact lens use or tap water exposure.
Parasites in the eyes are killed using specific prescription medicines, specialized eye drops, or surgical removal by a doctor.
Common medical options for killing and getting rid of parasites in the eyes, include antiparasitic drugs like albendazole, ivermectin, and biguanide eye drops, depending on the exact type of organism.
Medical Treatments by Parasite Type include:
Acanthamoeba (Amoeba): Treated with topical biguanide chemical eye drops, though the cysts are very hard to destroy.
Roundworms and Eye Worms: Treated with oral anti-parasite drugs like albendazole or ivermectin, or removed live with medical tools by an eye surgeon.
Toxocariasis: Managed using steroid eye drops or anti-inflammatory drugs to stop tissue damage from the immune system.
Also never try to grab or pull at any visible worm from your eye yourself as it can cause permanent blindness and never use any home mixtures like garlic, lemon juice or even any other chemicals into your eye to get rid of parasites and instead see a doctor for proper treatment.