5 results about "Emmetropia" patented technology

Systems and methods for intraocular lens (IOL) selection using emmetropia zone prediction include determining pre-operative measurements of an eye, estimating a post-operative anterior chamber depth (ACD) of an intraocular lens based on the pre-operative measurements, estimating a post-operative manifest refraction in spherical equivalent (MRSE) of the eye with the IOL implanted based on the pre-operative measurements and the estimated post-operative ACD, determining whether the eye with the IOL implanted is likely to be in an emmetropia zone based on the estimated post-operative MRSE, re-estimating the post-operative MRSE of the eye with the IOL implanted using an emmetropia zone prediction model or a non-emmetropia zone prediction model based on the emmetropia zone determining, and providing the re-estimated post-operative MRSE to a user to aid in selection of an IOL for implantation in the eye.

According to some embodiments, an ophthalmic surgical system for treating presbyopia includes controllable components and a computer. The controllable components include a light source for generating a light beam and a scanner for guiding the focus of the beam. The computer determines an ablation profile to remove tissue from the central and peripheral regions of the cornea of ​​the first eye in a pair of eyes. The ablation profile is designed to: remove tissue from the central region to create a protrusion to provide near vision, and remove tissue from the peripheral region to correct to emmetropia.

The application relates to the field of ophthalmology and provides a method for converting curvature eye axis into equivalent spherical lens, which comprises the following steps: detecting the value of corneal curvature K through a corneal curvature instrument; detecting the value of eye axis AL through an eye axis measuring instrument; finding a reference line a at the eye axis rate ratio reference scale of a conversion mechanism according to the age of a detector; finding the value b of the eye axis AL on an eye axis calibration scale, moving a first mark part on an eye axis curvature calculation scale to the value b, and reading the value c of the eye axis curvature calculation scale at the value a; finding the value c on a curvature calibration scale, moving the value c on the curvature calibration scale to the reference line a; finding the value d of the corneal curvature K on the curvature calibration scale, moving a second mark part to the value d; and reading the value SE of the reference line a on an SE calibration scale. The application combines the axis rate ratio (AL / CR) reference value of emmetropia people of different ages to quickly convert the method of equivalent spherical lens. The application solves the technical problem of time-consuming and labor-consuming in obtaining accurate equivalent spherical lens when establishing a student refractive development file.

In certain embodiments, an ophthalmic surgical system for creating a lenticule in a cornea of an eye includes controllable components (including a laser source and a scanner) and a computer. The laser source generates a laser beam, and the scanner directs a focal point of the laser beam. The computer determines a lenticule design for a lenticule having a posterior side and an anterior side. The anterior side or the posterior side has a central portion and a peripheral portion. The lenticule design is formed using a primary lenslet and a secondary lenslet, where the primary lenslet is designed to correct for emmetropia. The lenticule design is formed by subtracting the secondary lenslet from the primary lenslet, where subtracting the secondary lenslet creates the central portion. The computer instructs one or more of the controllable components to create the lenticule.

An eyeglass lens is provided that includes a clear zone arranged at the center of the eyeglass lens, the clear zone having an optical power adjusted to provide emmetropia, and a refractive power zone having a refractive power that provides an optical power that deviates from the optical power of the clear zone. The eyeglass lens further includes an annular diffractive power zone having a diffractive add power that provides an optical power that deviates from the optical power of the clear zone, wherein the refractive power zone is arranged radially outward of the diffractive power zone.