A booth, for using the Teller technique to quantify visual acuity, irrespective of a patient's verbal ability booth comprises a modular structure, making up an isolated environment for the patient to perform the acuity test through the reading of Teller cards. The patient is accommodated in a visualization area at the central portion of a movable wall sliding via wheels on rails installed on the ground and ceiling by profiles. The modular structure presents a white and opaque tone, as well as its own lighting which is controlled and proper according to the test, in front of a movable wall and coplanar to a rear wall of booth. The movable wall sliding effects the distance adjustment between the patient and the visualization area cards where the minimum distance is equivalent 38 centimeters and the maximum distance is 55 or 84 centimeters as accuracy dictates, according to the patient's features.

A slit lamp microscope according to an embodiment of the present technology includes an illumination optical system, an imaging optical system, and a display unit. The illumination optical system emits slit light toward an eye to be examined. The imaging optical system images light reflected by the eye to be examined. The display unit has a display surface that displays a captured image obtained by imaging the eye to be examined, in which a relationship that a direction perpendicular to the display surface is parallel to a predetermined surface direction including an imaging direction of the imaging optical system is maintained. Accordingly, a novel operation can be performed.

The present specification relates to a contact lens having an integrated light source for electroretinography and a method for preparing same, the contact lens, having an integrated light source for electroretinography, comprising: a light source; a scattering material for scattering light from the light source; and an electrode for measuring changes in the electroretinogram due to the stimulation from the light source.

A microsurgical instrument includes a cannula with a straight segment at a proximal end and a parting tip at a distal end. The parting tip includes a parting tip projection, a convex parting edge formed on the parting tip projection, and a spatulated parting face. The spatulated parting face includes a convex surface portion formed on the parting tip projection and a concave surface portion joined to the convex surface portion along a line of inflection at a proximal end of the parting tip projection. The microsurgical instrument optionally includes a cannula head attached to the cannula. The cannula head includes a tapered outer surface, a circumferential outer flange, an arcuate inner flange, and an inner flange ridge extending radially away from the inner flange. A payload guide attached to the cannula and cannula head directs payloads into the lumen of the cannula.

An ophthalmic apparatus includes a light source, an illumination optical system, an optical scanner, an imaging optical system, and a controller. The illumination optical system is configured to generate slit-shaped illumination light using light from the light source. The optical scanner is configured to deflect the illumination light to guide the illumination light to a fundus of a subject's eye. The imaging optical system is configured to guide returning light of the illumination light from the fundus to an image sensor. The controller is configured to control the image sensor using a rolling shutter method. The illumination optical system includes a slit with a slit-shaped aperture capable of being arranged at a position substantially conjugate optically to the fundus, an iris aperture arranged between the light source and the slit, and configured to be capable of being arranged at a position substantially conjugate optically to an iris of the subject's eye; and an optical element arranged between the light source and the iris aperture, and configured to deflect the light from the light source.

Improved optical coherence tomography systems and methods to measure thickness of the retina are presented. The systems may be compact, handheld, provide in-home monitoring, allow the patient to measure himself or herself, and be robust enough to be dropped while still measuring the retina reliably.

Described are various embodiments of a light field device and vision-based testing system using same. Different embodiments provide for a vision-based testing device comprising a one or more view zone optimization techniques such as, but not limited to, a predominant view zone isolator, a view zone output realignment solution, and a coarse view zone adjustment transfer solution, as well as other view zone artefact reduction techniques and multi-depth perception adjustment techniques.

An electroactive device may include (1) an electroactive polymer element having a first surface and a second surface opposite the first surface, the electroactive polymer element comprising a nanovoided polymer material, (2) a primary electrode abutting the first surface of the electroactive polymer element, and (3) a secondary electrode abutting the second surface of the electroactive polymer element. The electroactive polymer element may be deformable from an initial state to a deformed state by application of an electrostatic field produced by a potential difference between the primary electrode and the secondary electrode. Various other devices, systems, and methods are also disclosed.

In certain embodiments, an ophthalmic surgical system for viewing an eye includes an ophthalmic microscope and a laser device. The ophthalmic microscope receives light reflected or scattered backwards from within the vitreous of the eye in order to provide an image of an object within the vitreous. The ophthalmic microscope includes a slit illumination source (which includes a light source and an optical element), a spectral filter, and oculars. The slit illumination source illuminates the eye with light, where the light source provides the light, and the optical element directs the light into the eye. The spectral filter filters out red spectral components of the light. The oculars receive the light from the eye in order to provide the image of the object. The laser device generates a laser beam to direct towards the object within the eye.

In certain embodiments, an ophthalmic system for visualizing an interior of an eye includes an illumination system and a visualization system. The illumination system illuminates the interior of the eye. The illumination system includes an annular illuminator that directs annular illumination, which has an illumination axis, towards the interior of the eye. The visualization system provides an image of the interior of the eye. The visualization system comprises visualization optical elements, which include an objective lens and oculars. The objective lens receives light reflected from the interior of the eye. The oculars, which have an ocular axis, transmit the reflected light to yield an image of the interior of the eye. In other embodiments, the illumination system comprises a multi-beam illuminator that directs multiple illumination beams towards the interior of the eye.