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The (ocular refraction) is the process by which the eye's optical system—primarily the cornea and crystalline lens —bends light to focus it precisely on the retina . When this process works perfectly, it is called emmetropia , and the image of distant objects is sharp. If the light does not focus correctly, it results in an ametropia or refractive error. Anatomy of Ocular Refraction

The eye functions as a convergent optical system with a total power of approximately . Download rГ©fraction l'oeil pdf

When the eye's length or refractive power is mismatched, images become blurry: Troubles de la réfraction : - Clinique Honoré Cave The (ocular refraction) is the process by which

: Provides about 70% of the eye's refractive power (approx. 43 diopters). It has a fixed curvature. Anatomy of Ocular Refraction The eye functions as

: Transparent fluids with a refractive index of approximately 1.336 (similar to water). Common Refractive Errors (Ametropias)

: Provides about 20 diopters . Unlike the cornea, it is flexible and changes shape to focus on near objects, a process known as accommodation .