Background One of the most common eye problemsare refractive errors. They occurwhen cannot clearly focus images. Which result in a blurred vision,sometimesthey are so severe that they causevisual impairment. Aim The study is to resolute error types 20-40 years-old population. Methodology 300 patients aged from20 40 years old who attend Duhok Eye Hospital;Duhok governorate;Kurdistan including fr...

The first patients were treated with proton beams in 1955 at the Lawrence Berkeley Laboratory in California. In 1970, proton beams began to be used in research facilities to treat cancer patients using fractionated treatment regimens. It was not until 1990 that proton treatments were carried out in hospital-based facilities using technology and techniques that were comparable to those for moder...