Interferometric measurements of the tear film irregularities on the human cornea

Dorota H. Szczesna; Jaroslaw Jaronski; Henryk T. Kasprzak; Ulf Stenevi

doi:10.1117/12.622176

23 September 2005 Interferometric measurements of the tear film irregularities on the human cornea

Dorota H. Szczesna, Jaroslaw Jaronski, Henryk T. Kasprzak, Ulf Stenevi

Proceedings Volume 5959, Medical Imaging; 59590A (2005) https://doi.org/10.1117/12.622176
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

The pre-ocular tear film is the most anterior refractive surface of the eye. Its stability plays an important role in the condition of vision from the optical and physiological point of view. If the eye is opened for a significantly long time or suffers from an anormalities in tear production, there appear isolated dry islands - break-ups - with a random distribution in the continuous lacrimal film. We applied an interferometric method - Lateral Shearing Technique for investigating the tear film stability and the smoothness of the tear film surface. This method is non-invasive and it is characterised by the high accuracy and sensitivity. Interferometry allows dynamic measurements of the tear film stability in real time by observation of interference fringes. The evaporation of tears and appearance of the breakups causes changes in the fringe geometry. Fast Fourier Transform has been used for quantitative assessment of the fringe smoothness and as a consequence of the tear film surface geometry. This paper presents the method used for quantitative evaluation of the tear film distribution on the cornea. Examples of interferograms recorded on eyes of patients with healthy eyes, suffering from dry eye syndrome and wearing contact lenses are also given. With our technique we were able to observe distinct differences in stability of the tear film between healthy and dry eyes, and the tear film on contact lenses.

Citation Download Citation

Dorota H. Szczesna, Jaroslaw Jaronski, Henryk T. Kasprzak, and Ulf Stenevi "Interferometric measurements of the tear film irregularities on the human cornea", Proc. SPIE 5959, Medical Imaging, 59590A (23 September 2005); https://doi.org/10.1117/12.622176

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