Photic retinopathy is damage to the eyes retina, particularly the macula, from prolonged exposure to solar radiation or other bright light, e.g., lasers or arc welders. The term includes solar, laser, and welders retinopathy and is synonymous with retinal phototoxicity. It usually occurs due to staring at the Sun, watching a solar eclipse, or viewing an ultraviolet, Illuminant D65, or other bright light. [1]

Signs and symptoms
Long-term reduced eyesight
Central or paracentral scotomaVision loss due to solar retinopathy is typically reversible, lasting for as short as one month to over one year. The fundus changes are variable and usually bilateral, mild cases often show no alteration and moderate to severe cases show a foveal yellow spot on the first days after exposure. After a few days it is replaced by a reddish dot often surrounded by pigment. Permanent holes and lesions are possible; prognosis worsens with dilated pupils or prolonged exposure. Pathophysiology
Although it is frequently claimed that the retina is burned by looking at the Sun, retinal damage appears to occur primarily due to photochemical injury rather than thermal injury. The temperature rise from looking at the Sun with a 3-mm pupil only causes a 4 °C increase in temperature, insufficient to photocoagulate. The energy is still phototoxic: since light promotes oxidation, chemical reactions occur in the exposed tissues with unbonded oxygen molecules.
Pyrantel is a medication used to treat a number of parasitic worm infections. This includes ascariasis, hookworm infections, enterobiasis (pinworm infection), trichostrongyliasis, and trichinellosis. It is taken by mouth.Side effects include nausea, headache, dizziness, trouble sleeping, and rash. A lower dose should be used in people with liver disease. While it does not appear to be harmful during pregnancy, it has not been studied for this use. It is unclear if it is safe for use during breastfeeding. It is in the antihelmintic family of medications. It works by paralyzing worms.Pyrantel was initially described in 1965. It is on the World Health Organizations List of Essential Medicines. Pyrantel is available as a generic medication. It costs less than US$25 per course of treatment in the United States. It may also be used to treat worms in a number of other animals. Pregnancy and breastfeeding
Pyrantel pamoate is considered a pregnancy category C drug for use during pregnancy for humans, but is in category A for canines and felines. Pyrantel is considered safe to use in nursing animals. Mechanism of action
Pyrantel pamoate acts as a depolarizing neuromuscular blocking agent, thereby causing sudden contraction, followed by paralysis, of the helminths. This has the result of causing the worm to "lose its grip" on the intestinal wall and be passed out of the system by natural process. Since Pyrantel is poorly absorbed by the hosts intestine, the host is unaffected by the small dosage of medication used.