In-vivo dynamic light scattering measurements in the vitreous of the human eye are presented. The set-up employs single-mode optical fibers for the delivery of the excitation beam and for the collection of the scattered light. High sensitivity and good spatial resolution are achieved using a novel scattering geometry: the excitation beam is shaped into a hollow cone and the scattered light collected through its central part. The apparatus exhibits excellent safety characteristics: the optical power entering the patient's eye is 36 times less than the maximum laser power at the cornea recommended for intrapupil exposure by the ANSI standard. Following a description of the instrument, examples of in-vivo measurements in the vitreous are discussed in order to demonstrate the possible clinical use of this technique.
Dynamic light scattering spectroscopy of in-vivo human vitreous / Rovati, Luigi; Franz Fankhauser, J. r.; Jaro, Ricka. - STAMPA. - 2632:(1996), pp. 73-78. (Intervento presentato al convegno SPIE photonic west tenutosi a S. Jose nel 1996).
Dynamic light scattering spectroscopy of in-vivo human vitreous
ROVATI, Luigi;
1996
Abstract
In-vivo dynamic light scattering measurements in the vitreous of the human eye are presented. The set-up employs single-mode optical fibers for the delivery of the excitation beam and for the collection of the scattered light. High sensitivity and good spatial resolution are achieved using a novel scattering geometry: the excitation beam is shaped into a hollow cone and the scattered light collected through its central part. The apparatus exhibits excellent safety characteristics: the optical power entering the patient's eye is 36 times less than the maximum laser power at the cornea recommended for intrapupil exposure by the ANSI standard. Following a description of the instrument, examples of in-vivo measurements in the vitreous are discussed in order to demonstrate the possible clinical use of this technique.
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