Blepharoplasty
Blepharoplasty: Plastic surgery on the eyelids. Blepharoplasty may be done to correct ptosis (sagging eyelids), remove fatty bulges around the eyes, and eliminate hanging skin from the eyelids, often times a cosmetic procedure to improve appearance but may be medically necessary as when the sagging is blocking the field of vision.
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- Blepharoptosis
Blepharoptosis: an abnormal, low-lying upper eyelid margin. Drooping eyelids may occur on both sides (bilateral) or on one side only (unilateral), in which case it is more easily noticed. Congenital ptosis is eyelid drooping that is present at birth; when it develops later, it is referred to as acquired ptosis. Blepharoptosis may be barely noticeable […]
- Blepharospasm
Blepharospasm: The involuntary, forcible closure of the eyelids. The first symptoms may be uncontrollable blinking. Only one eye may be affected initially, but eventually both eyes are usually involved. The spasms may leave the eyelids completely closed, causing functional blindness even though the eyes and vision are normal. Blepharospasm is a form of focal dystonia.
- Blighted ovum
Blighted ovum: A fertilized ovum (egg) that did not develop or whose development ceased at an early stage, before 6 or 7 weeks of gestation. On the ultrasound examination of a blighted ovum, only the gestational sac that normally surrounds the embryo can be seen. There is usually no embryo inside the gestational sac. A […]
- Blind spot
Blind spot: In ophthalmology, a blind spot is: A small area of the retina where the optic nerve enters the eye; this type of blind spot occurs normally in all eyes. Any gap in the visual field corresponding to an area of the retina where no visual cells are present; this type of blind spot […]
- Blind
Blind: 1. Unable to see. Without part or all of the sense of sight. 2. In a clinical trial, not to know the treatment given or received. The participant is not told whether they are in the experimental or control arm of the study. Also called masked.