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Diffraction spikes are lines radiating from bright light sources, causing what is known as the starburst effect [1] or sunstars [2] in photographs and in vision. They are artifacts caused by light diffracting around the support vanes of the secondary mirror in reflecting telescopes , or edges of non-circular camera apertures , and around ...
Some post-LASIK patients see halos and starbursts around bright lights at night. [1] Complications due to LASIK have been classified as those that occur due to preoperative, intraoperative, early postoperative, or late postoperative sources: [54] According to the UK National Health Service, complications occur in fewer than 5% of cases. [51]
The northern lights will be visible for parts of the northern U.S., according to the NOAA Space Weather Prediction Center's aurora forecast. The aurora will be visible over much of Canada and ...
It is light-sensitive and communicates visual messages to the brain. If the retina detaches, it moves and shifts from its normal position. This can cause photopsia, but can also cause permanent vision loss. Medical attention is needed to prevent vision loss. Procedures may include laser treatment, freezing, or surgery.
The aurora borealis put on a dazzling light show in Indiana this weekend. Here's a look at what people were seeing from French Lick to Indianapolis. Northern lights in Indiana: Here's what ...
Look for a light therapy box that provides 10,000 lux of light exposure, turn it on within the first hour of waking up, and use it for 20 to 30 minutes. Dry air. Bye, bye moisture. Winter air is ...
Outside In is a Federally Qualified Health Center (FQHC) and a licensed mental health agency, [jargon] [9] and also operates a needle exchange. [23] The syringe exchange, implemented in 1989, was the first one to be developed and the third to go into operation in the country. [24]
They hail everywhere from Vanderburgh County to Dale, Indiana, to Henderson, Kentucky. Some Evansville residents -- including those at this home in the 600 block of East Oregon Street -- go all ...