tear meniscus

tear meniscus 

A thin strip of tear fluid with concave outer surfaces at the upper and lower lid margins. It contains most of the exposed tear volume. The absence of a tear meniscus is an indication of a dry eye. Syn. marginal tear strip; lacrimal prism; tear prism. See precorneal film; lacrimal lake.
References in periodicals archive ?
Anterior segment-optical coherence tomography (AS-OCT) has rapidly become a valuable tool in the field of ophthalmology Dry eye evaluation by measuring the tear meniscus and tear film with AS-OCT has been well described previously.
In this study, we investigated the effects of ab interno trabeculotomy using the Trabectome system on tear film stability in terms of superficial punctate keratitis, tear film breakup time (TBUT), height of the tear meniscus, and tear film lipid layer interference patterns as well as visual acuity, which was assessed using a conventional visual acuity test and FVA test.
Meniscus injuries can be classified and direction describing the geometry of the tear meniscus damage there as longitudinal, radial, horizontal, and combinations of these.
Using a single use, disposable test chip, 100nl of tear fluid is collected by passive capillary action from the tear meniscus. The pen monitors the collection process and provides an audible and visual signal when the sample of tears has been collected.
A preoperative assessment of tear meniscus height was done using slit lamp after staining the tear film with 2% Fluorescein, ROPLAS (Regurgitation on pressure over lacrimal sac area) and sac syringing was performed with normal saline and results noted.
All patients were conducted the history taking, common ophthalmological examination (visual acuity test, biomicroscopy, direct ophthalmoscopy, tonometry, perimetry), objective examination (decrease or absence of the tear meniscus at the eyelid margins, presence of conjunctival mucous secretions in the form of threads, local swelling of bulbar conjunctiva with superimposing on the free edge of the eyelid, flaccid conjunctival hyperemia, inclusions polluting the tear film).
All participants in this study were Koreans who underwent comprehensive ophthalmological examinations and assessments of the lacrimal drainage system, including tear meniscus height measurements, the fluorescein dye disappearance test (FDDT), the lacrimal syringing test, lacrimal probing, nasal endoscopic examinations, and dacryocystography (DCG).
* Tear Meniscus Height and Regularity--ideally use a horizontal beam and read the height off the scale (normal height = 0.2mm)
The physical examinations of dry eye include Schirmer test, upper and lower tear meniscus height, tear film breakup time, corneal fluorescein staining, and construction and function of meibomian gland.
* Perform a fluorescein assessment, checking: tear break-up time--the interval in seconds--between the last blink and the first appearance of a dark spot or streak in the tear film, the tear meniscus height and regularity--ideally use a horizontal beam and read the height off the scale, and staining--note location, extent and depth.