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Hyperopia is an optical defect of vision (refractive error) when the eyeball is too short or refraction optical system of the eye is too weak. Reduced bulb 1 mm is a refractive defect + 3 D.

So that parallel rays of light coming into the eye, fall after passing through its optical system precisely at the sharpest vision on the retina, the eye must be maintained in the correct ratio of its length and thickness of the optical system. If the eye is too short, it impinges on the converging beams focused behind the retina, which gives rise to a hazy or indistinct image.


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