Installing a central air conditioner costs on average $2650, although it can cost as much as $15,000. This installation cannot be considered a DIY project, and it is traditional for a homeowner to hire a contractor for the job. Cost breakdown.
If the light blue iris ring you are seeing is at or near the margin between the iris (colored part of your eye) and the sclera (white part) and forms a large ring around that margin it is likely to be a deposit of cholesterol. It does not damaging to the eye and does not interfere with vision.
The large cavity of the eye is filled with a jelly like substance called vitreous. When we are born it is attached to the back surface of the eye, the retina. As we age the vitreous shrinks. So at some point it has to separate from the retina. This can irritate the retina and cause flashing lights. It can also result in floating spots in our vision. This is because the vitreous surface that was against the retina is now floating in the center of the eye casting a shadow. Most of the time (99+%) this does not cause a problem.