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Tearvet-A
DESCRIPTION
TECHNICAL DATA
PRODUCT PICTURES
BROCHURE
ACCESSORIES
BIBLIOGRAPHY
TEARVET-A allows to quantify directly, and indirectly, each tear layer
With white LEDs lighting, the device displays in vivo the phenomenon of interference fringes to assess the thickness of the lipid component of the tear and run the NiBUT.
With blue LEDs lighting (with the fluorescein) it creates a large area and allows you to perform the BUT (instilling fluorescein) of large diameter scleral and mini scleral contact lenses.
Immediate interpretation and follow up
Through the use of GRADING SCALE dedicated to each value obtained from the exams, the interpretation of the obtained data results is easy and immediate by using the iPad like a real platform dedicated to the analysis of dry eye.
It is possible to have detailed temporal graphics that allow to demonstrate in simple steps the need of the treatments and then the effective functioning of these.
Supplied accessories
The system is provided with a kit of useful grids to perform different screenings. All filters are already present in the system software and this includes tests to evaluate and diagnose dry eye problems and can recommend artificial tears.
  • Measurement of BLACK LINE (MLMI)
  • Evaluation of the integrity of cornea and ascertaining the presence of corneal scars and bruises.
Accessories
  • Blue and white Led
  • Three different grids to observe the quality of the tear film and measure the NIBUT.
Lipid, acqueous and mucous layer analysis
Through a quick and easy acquisition of a series of 3 blinks, TEARVET-A allows to obtain the thickness of lipid layer of the tear film classifying it in 5 different categories in a quick and precise way.
There is its related grading scale for comparison over time to do a detailed and precise follow up.
The aqueous layer forms the biggest part of the tear film. The device, in a non invasive way, can quantify its presence on the ocular surface to have a value comparable to the Schirmer’s test result.
For the mucin layer, TEARVET-A evaluates the break up time of the tear film and then the stability through the classic BUT with possibilities
Tear meniscus height measurement
The tear film is the thin layer of liquid (about 8 μ, its thickness is variable according to the considered portion and it results at maximum at cornea level) composed 98% of water and for the remaining 2% by protein and lipids, that is continuously and uniformly distributed on the ocular surface thanks to the eyelids blinks.
In dogs and cats the PTF thickness is about 8 μ on the cornea but it is much thicker at the meniscus, where in human being reaches up to 0,2 to 0,5 mm (200-500 µ).
By examining the meniscus it is possible to evaluate the lacrimal gland acqueous production.
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Accessories

TABLE
GRIDS
BRIEFCASE
Bags, resistant material to large stresses, have the particularity to be watertight with IP 67 impermeability and the perfect seal for liquids and dust, this is ensured by a rubber seal along the entire closure profile; is also present in all models a balancing valve of the internal and external pressure.
BATTERIES

Veterinary Bibliography

1. Carrington SD et al. Polarized light biomicroscopic observations on the precorneal tear film: 1. The normal tear film in the dog. The Journal of Small Animal practice, 1987, 28, 605-622
2. Carrington SD et al. Polarized light biomicroscopic observations on the precorneal tear film: 2. Keratoconjunctivitis sicca in the dog. The Journal of Small Animal practice, 1987, 28, 671-679
3. Carrington SD et al. Polarized light biomicroscopic observations on the precorneal tear film: 3. The normal tear film in the cat. The Journal of Small Animal practice, 1987, 28, 821-826
4. Davidson HJ, Kuonen VJ. The tear film and ocular mucins, Veterinary Ophthalmology, 2004, 7, 2, 71-77
5. Cullen CL et al. Tear film breakup times in young healthy cats before and after anesthesia. Veterinary Ophthalmology 2005, 8,3, 159-165
6. Featherstone HJ,  Heinrich CL. Ophthalmic examination and diagnostics. In Veterinary Ophthalmology, edited by KN Gelatt, BC Gilger, TJ Kern, fifth edition, vol. 1, 2013, 533-613. Wiley-Blackwell, Ames, Iowa, USA
7. Geerling G et al. The International workshop on Meibomian  gland dysfunction: report of the subcommittee on management and treatment of MGD. Investigative Ophthalmology & Visual Science, 2011, 52, 2050-2064
8. Hodges RH, Dartt DA. Tear film mucins: front line defender of the ocular surface; comparison with airway and gastrointestinal tract mucins. Exp Eye Res, 2013,117, 62-78
9. Inatomi T, Spurr-Michaud S, Tisdale AS, Gipson IK. Human corneal and conjunctival epithelia express MUC1 mucin. Investigative Ophthalmology and Visual Science 1995; 36: 1818-1827
10. Knop E et al. The International workshop of Meibomian gland dysfunction: report of the subcommittee on anatomy,physiology and pathophysiology of the Meibomian gland. IOVS 2011, 52,4,1938-1978
11. Lemp MA et al. The definition and classification of dry eye disease: Report of the Definition and Classification Subcommittee of the International Dry Eye WorkShop (2007). Ocul Surf 2007, 5(2):75-92
12. Lozato PA et al. The lipid layer of the lacrimal tear film: physiology and pathology. J Fr Ophthalmol, 2001, 24, 6, 643-658
13. Maggio F, Pizzirani S. Patologie del film lacrimale e delle superfici oculari nel cane e nel gatto. Parte 1. Cenni di fisiopatologia
14. Maggio F,  Pizzirani S. Patologie del film lacrimale e delle superfici oculari nel cane e nel gatto. Parte 2. Segni clinici, diagnosi e terapia. Veterinaria, 2009, 23, 5, 55-70
15. Maggs DJ, Miller PE, Ofri R. Slatter's Fundamentals of Veterinary Ophthalmology. Fifth edition, 2013, Elsevier St Louis
16. Miller PE.  Lacrimal System in Slatter's Fundamentals of Veterinary Ophthalmology. 2013 Editors DJ Maggs, PE Miller, R Ofri.  Elsevier St Louis
17. Nichols KK et al. The International workshop on Meibomian  gland dysfunction: executive summary. Investigative Ophthalmology & Visual Science, 2011, 52, 1922-1929
18. Saito A, Kotani T. Estimation of lacrimal level and testing methods on normal beagles. Veterinary Ophthalmology 2001, 4, 1,7-11
19. Sebbag L  et al. Reference values, interest correlations, and test -retest repeatability of selected tear film tests in healthy cats. J Am Vet Med Assoc. 2015, 15, 246 (4), 426-435
20. Sebbag L et al. Goblett cell density and distribution in cats with clinically and histologically normal conjunctiva. Veterinary Ophthalmology 2016, 19, suppl. 1, 38-43
21. Wang J et al. Relationships between central tear film thickness and tear menisci of the upper and lower eyelids.  Investigative Ophthalmology Visual Sciences October 2006, 47, 10,  4349-4355
22. Yokoi N et al. Reflective meniscometry: a new field of dry eye assessment. Cornea, 2000 May;19 (3 Suppl): 37-43

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