ساينس الصف الثالث الاعدادي – الفصل الدراسي الاول ساينس تالتة اعدادي – ترم اول In This part we will study : The vision The eye works in such way: – the light rays reflect from the body to fall on the eye. – The light rays refract when passing through the cornea then the lens (convex lens). – The refracted rays are collected on the retina forming a small, real inverted image. Short-sightedness: It is a vision defect through which near objects can be seen clearly but far objects seem distorted. Long-sightedness: It is a vision defect through which far objects only can be seen clearly but close objects are not seen clearly. Contact lenses: The contact lenses are used instead of the glasses. It is very thin lenses made of plastic, and can stick to the eye cornea by the eye fluid لمتابعة مستر احمد الباشا وكل ما يخص الساينس : جروب الفيس بوك http://bit.ly/2Of1mcN صفحة الفيس بوك http://bit.ly/2Gq5xMo بالتوفيق مستر احمد الباشا