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.
Usually holes and tears do not mean you will have serious vision problems right away. However, retinal holes and tears may cause fluid from the center of your eyeball to leak behind the retina. If enough fluid gets behind the retina, the retina can separate from the back of your eye. The detached part of the retina will not work properly.