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Refractive error Refractive-Error - Coggle Diagram
Refractive error 
Definition
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This is an eye disorder that occurs when the eye cannot clearly focus the image from the outside world
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Clinical manifestations
And other may include double vision, haziness,glare or halos around bright light, squintin, headaches, eye strain
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Pathophysiology
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The main types of refractive errors are myopia, hyperopia, presbyopia and astigmatism
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Refrences
Optics of the human eyeDA Atchison, G Smith, G Smith - 2000 - pdfs.semanticscholar.org
T Langaas, PM Riddell, E Svarverud… - Optometry and Vision …, 2008 - journals.lww.com