A protein which induces the growth of new blood vessels and is usually produced in response to impaired oxygen flow to tissues. It may be produced in increased quantity in diabetic retinopathy and age-related macular degeneration. The post Vascular endothelial growth factor (VEGF) first appeared on Optician Certification.| Optician Certification
The natural lens is suspended within the eye by elastic fibres around its circumference. These, and the lens capsule are retained during the cataract surgery to allow the lens implant to be supported in the position that the original lens occupied. The post Zonular fibres first appeared on Optician Certification.| Optician Certification
A transparent substance with the consistency of egg-white which occupies the space inside the eye behind the lens. The post Vitreous first appeared on Optician Certification.| Optician Certification
Surgical procedures involving the vitreous or the retina. The post Vitreo-retinal surgery first appeared on Optician Certification.| Optician Certification
A surgical procedure to remove vitreous from the eye. The post Vitrectomy first appeared on Optician Certification.| Optician Certification
A visual field test is an examination that may be performed to analyze a patient's visual field. The test may be performed by a technician directly, with the assistance of a machine, or completely by an automated machine. Machine based tests aid diagnostics by allowing a detailed printout of the patient's visual field. See Perimetry The post Visual field testing first appeared on Optician Certification.| Optician Certification
Field of vision: The entire area that can be seen when the eye is directed forward, including that which is seen with peripheral vision. The area visible to an eye that is fixating straight ahead. The post Visual field first appeared on Optician Certification.| Optician Certification
Ability to discern the details of an object. A normal average eye an angle of one minute of arc (1/60th degree). Assessment of the eye's ability to distinguish object details and shape, using the smallest identifiable object that can be seen at a specified distance (usually 20 ft. or 16 in.) and letter height (8.87mm). The post Visual Acuity first appeared on Optician Certification.| Optician Certification
Devices such as magnifiers and closed circuit television sets that can help people with sub-normal vision see more and function better in day to day activities. Also known as Low Vision aids. The post Vision rehabilitation aids first appeared on Optician Certification.| Optician Certification
A group of conditions characterised by the inflammation of blood vessel walls. The post Vasculitis (plural: vasculitides) first appeared on Optician Certification.| Optician Certification