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Refractive Errors of the Eye

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Refractive Errors of the Eye

Eye Refraction 404
Arwa_Bohra
9 KEY FACTS
TYPES
Myopia
My Eye

Myopia is a refractive error that causes blurred distance vision.

Focal Point Anterior to Retina
Ant-eater Light Focus

Myopia is a refractive error that causes blurred distance vision. Due to the increased axial axis of the eyeball, the focal point of the eye is shifted in front of the retina.
Etiologies includes axial, curvatural, positional, index, and spasmodic myopia.

Increased Risk for Retinal Detachment
Up-arrow Risk Detached Red-tins

In myopia the retina is more stretched due to axial elongation and is prone to peripheral retinal tears. This may lead to rhegmatogenous retinal detachment.

Hyperopia
Hiker Eye

Hyperopia is a refractive error that causes close objects to appear blurry.

Focal Point Posterior to Retina
Focus Post-terrier to Retina

Hyperopia is a refractive error that causes blurred near vision. Patients will have a decreased axial axis of the eyeball, thus shifting the focal point of the eye behind the eyeball.

Increased Risk for Angle-closure Glaucoma
Up-arrow Risk Closed-angle Glock-eye

In hyperopia, decreased axial length causes decreased space for the aqueous humor to flow. This can lead to intraocular pressure elevation and angle-closure glaucoma

Astigmatism
Stick-Eye

Astigmatism is a condition in which parallel rays of light cannot form a point image on the retina due to the existence of two or more focal points. It is associated with an abnormal corneal curvature.

Abnormal Corneal Curvature
Abnormal Curved Corn

Normally, the cornea has the same curvature along all axes. If the shape of the cornea becomes irregular, 2 or more different sized axes are produced, resulting in different points of convergence, or focal points. This will result in scattering of the image and blurring of vision in all axes.

Increased Risk for Amblyopia
Up-arrow Risk Amber-Lazy-eye

Amblyopia means lazy eye. If at birth, astigmatism is present, the brain will primarily use the input for depth perception from the normal eye. This leads to decreased nervous output to the abnormal eye, which may then suffer from amblyopia.

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