Instrument which requires the patient to inform the operative of their ability or not to see numerous images in different positions on a screen to assess the patient’s field of view. Used for the early diagnosis and treatment of the diseases that cause field loss such as glaucoma.
F (Field Analyser to Fovea)
Seen even when the eyes are closed. Often quite normal in an aging eye as the vitreous pulls away from the retina. Can last for several months but should be investigated in case the retina is torn.
Floating particles within the vitreous often appearing like a moving thread. A sudden appearance or increase should be investigated.
The distance from the refracting (lens) or the reflecting (mirror) surface to the point of focus.
The small area of the retina that provides the sharpest vision by allowing the light to fall directly onto the cones without having to pass through any retinal layers.