what is myopia causes clinical feature and treatment

in error of the refraction eye lens in which parallel light rays are focused in front of retina instead of focusing on retina 

causes  

 ] eyeball may be longer



] refractive index of lens may be greater



]   cornea of eye may bend forward more then normal



clinical feature


}distant object cannot be seen clearly


} near object can be seen clearly


} usually no headache


}  headache by seeing toward sharp light


} may complain of black spot floating in front of eyes

• treatment

}   the error may be corrected by prescribing  concave lenses
}   the error may be corrected by refractive surgery