Light from an object passes through the cornea which is a transparent dome like structure covering the iris. The light rays are refracted by the cornea onto the lens. The light rays are refracted a second time whilst passing through the lens and focussed onto the retina â the light sensitive part of the eye.
The average Radon mitigation cost in Portland, Oregon, or Vancouver, Washington is between $800 to $2,500 with an average of $1,200.
1 The EPA's Installation and Operating Cost Table lists how much a radon mitigation system should cost based on the type of foundation.  Operating a radon mitigation system costs from nothing up to $700 per year. Many radon mitigation systems have fans that require continuous electric power that can add to power bills.