摘要:
The disclosed embodiments include eyesight assessment devices and methods to assess eyesight. In one embodiment, an eyesight assessment device includes a medium having one or more imaging functionalities and operable to project images for display based on the one or more imaging functionalities. The device also includes an optical source operable to project light and being positioned at one or more positions relative to the medium, such that at least one of images are projected from the medium based on the position of the optical source relative to the medium and the one or more imaging functionalities of the medium, where each image corresponds to an object provided for display at a virtual distance relative to a user of the eyesight assessment device, and where each image includes one or more of user assessable display characteristics that are indicative of a visual condition of the user.
摘要:
A method implemented by computer means for determining an optical function of an ophthalmic lens adapted to a wearer, the method comprising: - a wearer data providing step, during which wearer data comprising at least an indication of the hearing sensitivity of the wearer and an indication of the ophthalmic prescription of the wearer are provided, - an optical function determining step, during which an optical function adapted to the wearer is determined based at least on the wearer data.
摘要:
A technology for achieving a reduction in size of an ophthalmic apparatus capable of performing a plurality of kinds of measurements performed before cataract surgery is provided. An ophthalmic apparatus of an embodiment includes a refractive power measurement unit and an eyeball information measurement unit. The refractive power measurement unit is configured to project light from a light source onto a subject's eye and detect returning light thereof to determine refractive power of an ocular optical system of the subject's eye. The eyeball information measurement unit is configured to project light from the same light source onto the subject's eye and detect returning light thereof to determine eyeball information representing structure of the subject's eye.
摘要:
Disclosed are a hand-held vision detecting device and a method for using the hand-held vision detecting device to realize various eyesight measurements without wearing glasses and the steps therefor, wherein the hand-held vision detecting device at least comprises: an imaging lens group consisting of at least one imaging lens (16) and an eye chart (4). The cornea (15) of the subject can be located at the focal point at one side f the imaging lens group (16). The center of the eye chart (4) is provided at the other side of the imaging lens group (16) and can move forwards and backwards along the optical path. By using this device, the following functions can be achieved: 1. visual acuity measurement of the naked eye; 2. corrected visual acuity measurements; 3. measurements for detecting the strength of the glasses which should be worn when the corrected visual acuity is 1.0; 4. poor vision and amblyopia vision detection; and 5. astigmatism detection. People can detect vision anytime and anywhere through this device and detection method via simple and easy operations, and the detection results are accurate.
摘要:
A method of determining global shape parameters of a cornea is disclosed, the method comprising: -determining a height map of a cornea by: i. Illuminating a cornea of an eye using a stimulator source comprising a plurality of point sources; ii. capturing a reflected image of the plurality of point sources and determining a position of reflections of the respective plurality of point sources and iii. deriving the height map of the cornea based on a position of the plurality of point sources and the position of the reflections of the respective plurality of point sources; - fitting the height map as derived to a toric aspheric model to obtain a global fitting of the corneal surface to the toric aspheric model and; - using the global fitting to determine one or more parameters related to an astigmatism of the cornea.
摘要:
Disclosed are a hand-held vision detecting device and a method for using the hand-held vision detecting device to realize various eyesight measurements without wearing glasses and the steps therefor, wherein the hand-held vision detecting device at least comprises: an imaging lens group consisting of at least one imaging lens (16) and an eye chart (4). The cornea (15) of the subject can be located at the focal point at one side f the imaging lens group (16). The center of the eye chart (4) is provided at the other side of the imaging lens group (16) and can move forwards and backwards along the optical path. By using this device, the following functions can be achieved: 1. visual acuity measurement of the naked eye; 2. corrected visual acuity measurements; 3. measurements for detecting the strength of the glasses which should be worn when the corrected visual acuity is 1.0; 4. poor vision and amblyopia vision detection; and 5. astigmatism detection. People can detect vision anytime and anywhere through this device and detection method via simple and easy operations, and the detection results are accurate.
摘要:
[Problem] The invention provides an evaluation method capable of objectively evaluating average visual perception for a comparatively long period of time when a subject looks through an eyeglass lens to be evaluated, time-dependent change in visual perception, and visual perception when looking with both eyes, and the invention provides a design method, and the invention provides a calculation method for calculating characteristics of visual perception of the subject when viewing an object through a lens. [Solution] A subject is allowed to wear a lens to be evaluated, the subject is allowed to induce brain activity by allowing the subject to view a changing visual stimulus object that induces periodic brain activity through the lens to be evaluated, a change in faint electric current caused by the brain activity is time-dependently recorded as a change in a magnetic field (magnetic flux density) by use of a magnetoencephalograph, one or more among an amplitude, a power value, and a phase in a frequency that is an inverse number of a period of the periodic brain activity is or are calculated through fast Fourier analysis of the waveform, and the lens to be evaluated and the characteristic of visual perception of the subject are evaluated based on a magnitude of an amplitude or of a power value obtained above or based on a slowness/fastness of a phase obtained above.
摘要:
The optometry apparatus includes an index projecting optical system for projecting an index for cross cylinder test to an eye for shortening examination time, a variable cross cylinder lens disposed on an optical axis of the index projecting optical system, for forming one pair of projection images of the index by switching of an astigmatic axial angle while predetermined astigmatic power is set, a joystick lever and a button used to input a result of comparison between appearance states of the pair of projection images of the index, and an initial value setting unit for determining an astigmatic axial angle of the variable cross cylinder lens to cause one of the pair of projection images of the index visually recognized and to cause the other thereof in a blurred state based on objective values of astigmatic power and an astigmatic axial angle of the eye, measured in advance, and for setting the determined astigmatic axial angle as an initial value for astigmatic axial angle measurement.