First Stage Optics , Uruk university

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most common cause of astigmatism : Corneal astigmatism (true) Lenticular astigmatism Retinal astigmatism

Which categorized is not color blindness ?? deuteranopia Presbyopia ( true ) protanopia tritanopia

Can’t measuring in snellen chart : Myopia Hypermetropia Astigmatism Color blindness (true)

Visual acuity of normal vision is : 20/20 feets Or 6/6

If patient can not seen any letter in snellen chart . the vision considered is : Poor vision

If a ray of light is passing through a prism, which colour appears at the top of the spectrum? Violet (true) Red Green Yellow