In short sightedness ____ light from ____ objects converges in ____ of the retina because either the eyeball is too ____ or the lens is too ____, leading to ____ refraction of incoming light. To correct this condition opticians will prescribe glasses with ____ lenses (lenses that are ____ in the middle). In long sightedness ____ light from ____ objects converges ____ the retina because wither the eyeball is too ____ or the lens is too ____, leading to ____ refraction of incoming light. To correct this condition opticians will prescribe glasses with ____ lenses (lenses that are ____ in the middle). With the correct prescription, the images will fall ____ the retina and no longer appear ____. Contact lenses work in the same way but they are more ____ and can enable good vision when playing sport or ____. Contact lenses can only be worn for a certain number of ____ and can dry your eyes out. Some are ____ while others are more ____ and can be worn multiple times but these must be kept clean to prevent eye ____. Laser eye surgery can remove some of the thickness of ____ lenses but is only available to ____ as their eye muscles have stopped changing. Lenses can also be ____ removed and replaced with ____ lenses or a contact lens that covers the existing lens. With any form of surgery there is a ____ of infection

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