+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

An interferometric method for the dynamic evaluation of the tear film

, : An interferometric method for the dynamic evaluation of the tear film. Acta Ophthalmologica Scandinavica 85(2): 202-208

Purpose: This study describes a non-invasive method for the in vivo assessment of precorneal tear film stability.Methods: A lateral shearing interferometer (LSI) is used for the measurement. The interference fringes obtained from the tear film layer are analysed using the fast Fourier transform (FFT) technique. The method is based on evaluating the degree of fringe disturbance by calculation of the second momentum of Fourier spectra on the interferogram pattern.Results: This method points to the occurrence of dynamic changes in the tear film surface over time. We propose four different parameters. One of them is presented here. The less smooth the tear film, the more disturbed the interference fringes and the higher the value of the calculation parameters. Clear differences were discerned between tear film quality in healthy eyes, dry eyes and eyes with various contact lenses. The benefits of artificial tears used by patients with dry eye or contact lenses were also noted. Examination of dry eyes before and after applying fluorescein revealed significant differences in tear film stability.Conclusions: Lateral shearing interferometry is a suitable method for assessing the stability of the tear film on the cornea and on contact lenses. Evident differences can be demonstrated in tear film quality between normal eyes and dry eyes or eyes with soft contact lenses.


PMID: 17305735

DOI: 10.1111/j.1600-0420.2006.00802.x

Other references

Grodhaus, G.F.rrington, L.J., 1989: The occurrence of Chironomus (Lobochironomus) mendax Stora in North America. Journal of the Kansas Entomological Society 62(2): 292-293

Graber, A.L.; Cerchio, G.M.; Herl, B.J.; Seiler, D., 1968: Organization of a diabetic clinic at a military hospital: a coordinated team approach. Military Medicine 133(11): 900-903

Brolin, S.E.; Arturson, G., 1951: The response of the thymus to treatment with gonadotrophins in adrenalectomized rats. Thymic involution, measured by weight and histopathology, could be induced in male or female rats even after adrenalectomy by admn. of pituitary gonadotropins (a mixture of FSH and LH-"antex," Leo; or purified LH- "Gonadex," Le...

Warren, S.E.; Alpert, J.S.; Francis, G.S., 1978: Diet in the coronary care unit. American Heart Journal 95(1): 130-131

Aoyagi, H., 1950: Studies on the coral fishes of the Riu Kiu Islands. VII. Platacidae, Monodactylidae, Siganidae, Balistidae, Monacanthidae, Scorpaenidae. Zoological Magazine Tokyo, 59: 118-122

Alba, J.D.; Asdell, S.A., 1946: Estrous behavior and hormones in the cow. OBSEBVATIONS of oestrous behaviour were made on a herd of 1 old cow and about 15 heifers. Experiments with ovariectomised cows injected with increasing doses of oestrogen showed that there are 3 stages in the development of psychic heat: (1) comin...

Tadros, T.M., 1949: A preliminary investigation of assimilation, respiration and physico-chemical properties of Zygophyllum coccineum in relation to soil moisture. A detailed report, witn tables and graphs. Apparent assimilation increased with dryness of the soil up to a certain limit. The tissue water content was not affected by changes in soil moisture until the plant reached the wilting stage. Transpirati...

Westra, S.J.; Wallace, E.Christine., 2005: Imaging evaluation of pediatric chest trauma. Following a discussion of the various imaging manifestations of pediatric chest trauma by anatomic location, the authors discuss their diagnostic approach to the pediatric multitrauma patient with an emphasis on chest imaging.

Helles, F., 1974: Western Europe starting increased support for forestry. Hedeselskabets tidsskrift: 95 (4) 84-89

McKenney, J.M.; Wasserman, A.J., 1979: Effect of advanced pharmaceutical services on the incidence of adverse drug reactions. American Journal of Hospital Pharmacy 36(12): 1691-1697