A system for determining a rounded value of an optical feature of an ophthalmic lens including determining a first test value and a first variation increment, performing a first trial of said subjective test wherein two first different optical situations are determined based on at least the first test value, determining a second test value based on the first test value, on the first variation increment and on the result of the first trial, performing a second trial of said subjective test wherein two second different optical situations are determined based on at least the second test value, determining an intermediary value based on the result of the first trial and on the result of the second trial, and determining said rounded value by rounding said intermediary value to a reference value, said rounding modifying the dioptric correction of said ophthalmic lens by less than a predetermined basic dioptric value.

A subjective optometry apparatus includes: a subjective measurer which has a corrective optical system disposed on an optical path of a light projecting optical system configured to project a target light flux toward an examinee's eye and configured to change an optical characteristic of the target light flux and which is configured to subjectively measure an optical characteristic of the examinee's eye; an acquisitor configured to acquire position information on at least one of examinee's right and left eyes; a determiner configured to determine, based on the position information acquired by the acquisitor, whether or not subjective measurement can be implemented in a binocular open state of the examinee's right and left eyes, thereby acquiring determination information; and a determination information output unit configured to output the determination information acquired by the determiner.

A subjective refractor apparatus for astigmatism testing allowing observation along an optical observation axis with an optical vision correction of variable power. The apparatus allows a patient’s use of a tactile input device to control the rotary movement of rotatable optical elements with cylindrical power, varying the angular position of the optical elements to adjust the total cylindrical power and orientation of the cylinder axis of the resulting optical system. The tactile input device is capable of receiving input in two or more dimensions, with each dimension of input controlling the rotary movement of a single cylindrical optical element to adjust the combined cylindrical optical power of the two optical elements. The optical elements position readings may be sensed by rotational position sensors and sent to an operationally connected microprocessor for interpretation and display.

A subjective refractor apparatus for astigmatism testing allowing observation along an optical observation axis with an optical vision correction of variable power. The apparatus allows a patient’s use of a tactile input device to control the rotary movement of rotatable optical elements with cylindrical power, varying the angular position of the optical elements to adjust the total cylindrical power and orientation of the cylinder axis of the resulting optical system. The tactile input device is capable of receiving input in two or more dimensions, with each dimension of input controlling the rotary movement of a single cylindrical optical element to adjust the combined cylindrical optical power of the two optical elements. The optical elements position readings may be sensed by rotational position sensors and sent to an operationally connected microprocessor for interpretation and display.

A portable intelligent multi-function phoropter is disclosed. The phoropter comprises a casing, a plurality of control elements, two adjustable eyepiece modules, a plurality of micro motors, a liquid crystal display module, a control module and a power supply module. The casing of the present invention is small so that the overall volume is small, and it is convenient to carry and use. The present invention has many test patterns, so different vision tests can be performed. With the combination of convex lens and concave lens and the application of existing electronic components, the overall price is reduced. The invention satisfies the market demand for the phoropter.

A portable intelligent multi-function phoropter is disclosed. The phoropter comprises a casing, a plurality of control elements, two adjustable eyepiece modules, a plurality of micro motors, a liquid crystal display module, a control module and a power supply module. The casing of the present invention is small so that the overall volume is small, and it is convenient to carry and use. The present invention has many test patterns, so different vision tests can be performed. With the combination of convex lens and concave lens and the application of existing electronic components, the overall price is reduced. The invention satisfies the market demand for the phoropter.

Disclosed is a device that utilizes a light-field display to project a virtual continuum of real world perspectives of a natural scene to a plurality of observer viewpoints to simulate a natural environment. An observer perceives different perspectives as he or she moves through the simulated environment just like the observer would as if he or she were in a natural environment.

Disclosed is a device that utilizes a light-field display to project a virtual continuum of real world perspectives of a natural scene to a plurality of observer viewpoints to simulate a natural environment. An observer perceives different perspectives as he or she moves through the simulated environment just like the observer would as if he or she were in a natural environment.

Devices utilizing holographic 4D plenoptic capture and display technologies to generate a light field function to provide glasses-less vision correction for observers with imperfect vision, and to project an image according to the generated light field function, and methods for calibrating a four-dimensional light field for a user with an uncorrected visual acuity.

Devices utilizing holographic 4D plenoptic capture and display technologies to generate a light field function to provide glasses-less vision correction for observers with imperfect vision, and to project an image according to the generated light field function, and methods for calibrating a four-dimensional light field for a user with an uncorrected visual acuity.