Method for screening single-focus artificial lens and artificial lens obtained by same

Abstract

The invention discloses a method for screening single-focus artificial lens and artificial lens obtained by the same. The method comprises the following steps of: (1) implanting the single-focus artificial lens of the same brand and same model into multiple cataract patients by the same surgeon, 3 months after phacoemulsification and artificial lens implantation, using a defocus curve method to measure a focal depth value of the single-focus artificial lens and corneal combined lens, and taking a visual range covered by vision above 0.8 as standard; (2) obtaining actual post-focal depth data according to the focal depth value measured in the step (1), sorting all obtained data, and selecting a trusted interval to obtain a corresponding correction value, namely reserved diopter; (3) adopting a direct reservation method or an A constant correction method to screen the single-focus artificial lens of the brand and the model.

Description

technical field [0001] The invention relates to the technical field of artificial lenses, in particular to a screening method for single focus artificial lenses. Background technique [0002] The structure of the human eye is equivalent to that of a camera. The combined lens formed by the cornea and crystalline lens is equivalent to a lens, and the crystalline lens is equivalent to a focusing lens. Its thickness is changed by the scaling of the ciliary muscle, that is, the refractive power, which can adjust the focal length of far and near, allowing us to see things clearly. The pupil is equivalent to the aperture of a camera, which automatically shrinks or expands with the intensity of the light, and it can adjust the brightness of the light entering the eye. The retina is equivalent to the negative film of a camera, and the retina forms images by receiving light stimulation. [0003] We refer to the range of object space that obtains an "equal" clear image on the image p...

AI Technical Summary

Problems solved by technology

[0009] In the past, the design and clinical application of monofocal IOLs only considered focal vision, but did not take into account the depth of focus. The IOL calculated by the A constant did not take into account the depth of focus of the human eye, and only considered the 0 target diopter , after the light from an object 5 meters away enters the human eye, the focal point of the object image is just focused on the patient's retina. Above, but as the object moves forward, the focal point of the object image moves to the back of the retina. If the range of movement is within the range of the front focal depth, the human eye can still see the object clearly, but the human eye cannot see the object clearly after exceeding the focal depth range , therefore, the depth of focus of the patient has not been utilized, resulting in a waste of visual range

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