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.
Assuming that a star is so far away that it is barely visible to. the naked eye, we know that the Hubble telescope can make the star. appear 127,551 times brighter. Does this mean that the Hubble. telescope enables observer to see the star if it were 127,551 times.