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M Abrahamsson; The Reliability of Axial Measurements Using Laser Doppler Interferometry . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4364.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: The advantages of laserdoppler interferometry are high accuracy, high transversal resolution and more confort for the patient. It is a noncontact procedure. In this study is a methodological inovation of the laser doppler interferometer proposed and the variablility and accuracy of this modified technique is presented Methods: A laser interferometer where the optical pathway variations are based on rotating prisms is constructed. Measurements are performed using a probe both handheld and mounted. Variability of data is studied in two adult individuals and usability of the system is evaluated in 16 young children. Results: The validation of the method in the two adults based on 50 measurements resulted in a standard deviation of 51 µm with the mounted probe which increase to 64 µm with the handheld probe. The usability test showed that all 16 young children could easily be tested and restested. Conclusion: The laserinterferometer could be used to determine axial length in young children without anasthesia. A handheld probe which further ease the use of the equipment have a limited influence on the accuracy of the measurements.
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