DEVICE: Visionix VX650 (03664188000145)

An electrically-powered, ophthalmic device designed to be used by a healthcare professional to objectively measure the refractive error of the eye (the inaccuracies of focusing light upon the retina) by measuring how light is changed when it enters the patient's eye(s). The device emits light into the eye and detects the light reflection which is measured for sphere, cylinder, axis and/or high order aberration measurements, typically measured in dioptres (the reciprocal of the focal length of the lens expressed in metres). Also known as an aberrometer, the device uses this information to automatically calculate the lens prescription needed to correct the patient's vision.

An ophthalmic, battery-powered, measuring instrument designed for determining the intraocular pressure (IOP) by exerting an external force against the eye which provides a reading of the resistance of the tunica of the eye to deformation (the extent of corneal indentation) which is expressed in millimetre(s) of mercury (mmHg). This hand-held device (known as a contact type, e.g., a Perkins tonometer) is often used for, e.g., the examination of postoperative, bedridden and paediatric patients.

An electrically-powered ophthalmic instrument intended to be used for measuring the width or diameter of the pupil. The patient will, e.g., view into this device and the operator will see the pupil and its shape.

An electrically-powered optical device intended to be used to create digital colour photographic images/video of the ocular fundus (interior eye surface opposite the lens) through the pupil, to aid in diagnosing and monitoring retinal pathology; it may also be used for images/video of the anterior chamber. The image/video is typically transferred to a computer for display on its screen and/or for storage in a database. This device is also known as a retinal camera.