A substance which dyes the tear fluid when instilled into the eye, and is used in evaluating the fit of a contact lens by virtue of the fact that it fluoresces under ultra-violet light.
Dye used in ophthalmology to detect certain defects of the cornea (injuries and foreign bodies) and other abnormalities and to determine whether the fit of a contact lens is correct; appears a bright green color when visualized under an ultraviolet lamp.
An orange dye used in eye examinations to detect foreign bodies or injury to the cornea (the clear outer covering of the exposed surface of the eye). Fluorescein is placed in the eye with a dropper or a strip of blotting paper, and one must blink to spread the dye. The surface of the eye is then illuminated with a cobalt-blue light, which causes the fluorescein to glow green. Since the dye accumulates in regions where the corneal surface is disturbed by injury or infection, it allows the eye specialist to detect defects in the cornea. Fluorescein is also used in tonometry, the most common test for checking eye pressure. Fluorescein may be used after contact lenses are prescribed to determine whether tear flow under the lens is adequate. Application of fluorescein to the eye is painless. The dye is also used to study blood vessels in the eye.
A dye which has the special property of absorbing blue-light energy and emitting this energy as green light. This property is made use of when examining the cornea for scratches or ulceration; it is also used to detect abnormally permeable (or leaking) blood vessels in the retina and iris especially in diabetic retinopathy and diseases of the macula.
A fluorescent substance employed to investigate the cornea during examination.
Fluorescein is a harmless orange dye used in ophthalmology to assist in diagnosing certain eye disorders. When blue light is directed on it, the dye glows green when it comes into contact with defective cells. For the diagnosis of conjunctiva or cornea abrasions, fluorescein can be applied to the front of the eye. Additionally, it is administered intravenously during fluorescein angiography to identify abnormalities in the blood vessels of the retina, which are associated with conditions like macular degeneration and diabetic retinopathy.
A potent chemical dye applied to the eye to highlight the borders of a corneal ulcer, causing them to emit an orange-red glow when exposed to the dye.