Itâs Not the Needle That Hurts. I believe the pain is due to the solution used to clean the eye prior to the injection and not the needle itself. The solution is called âBetadineâ and is commonly used to cleanse the eye prior to intraocular injection. Most retina specialists use this a part of their routine.
For numerical convenience, an object brighter than 0th magnitude has a negative magnitude; the brightest star, Sirius is magnitude -1.4; the full moon is magnitude -13, and the Sun is a blazing -26th magnitude.
Apparent magnitude. (Apparent brightness) How bright a star appears to be, depends on how much light the start emits & how far away it is. -decreases inversely w/ the square distance between the sun and the observer. -for two identical starts, if one is twice as far away it is 1/4 as bright. Absolute magnitude.