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.
It should be obvious that the sun should top the list. Using the scale as defined above, the sun has an apparent magnitude of -26.7. The full moon is about -11, the planet Venus (at its brightest) is about -5. The brightest star is Sirius (actually Sirius A because it has a companion, Sirius B) is listed at -1.46. The very best telescopes are able to observe visually to about +30 to +36 on this scale.