Medical Surgical Nursing Summary Q/A notes

What is hypermetropia? - >>long sitedness, whereby light ray convergence at a point after the retina, and therfore out of focus. Nearby objects apphear blurry while distant objects are clearer what is myopia? - >>near/short sightedness, close is clear, far is blurry -usual starts in puberty and gets worse untill eye is fully grown. also in very young children. conditions associated with myopia? - >>squint- childhood eyes point in diff. directions. lazy eyechildhood, one eye. doesnt develop properly glaucoma - IOC pressure. cataracts - develpoment of cloudy atches inside lense. Retinal detachment - wherby retina pulls awat from the blood vessel that nourish it What is astigmatism? - >>Failure to converge image at one point on the fovea (likea refraction rather than focusing) Causes of astigmatism? - >>-Hereditary - corneal or lenticula