Ophthalmic Laser Interferometry

  title={Ophthalmic Laser Interferometry},
  author={Adolf F. Fercher and E H Roth},
  booktitle={Other Conferences},
If the pupil of the eye is illuminated by a collimated laser beam the light returning from the eye exhibits Newton's interference fringes. This phenomenon can be used (1) to measure fundus tissue pulsations and (2) to measure the optical length of the eye. A first series of clinical measurements of patients with angiological problems has shown a clear correlation of the interferometrically measured fundus pulsations with circulation conditions. First measurements of the optical length of human… 

Measurement of the anterior structures of the human eye by partial coherence interferometry

This technique has been further extended to measure the anterior chamber depth and the thickness of the lens, with a precision of 10 micrometers, more than one order of magnitude better than with conventional techniques.

Scanning laser interferometer for fundus profile measurement of the human eye

The laser Doppler interferometry (LDI) technique has been improved to measure the fundus profile and to obtain tomographic images of the human eye fundus, especially in the area of the optic nerve head.

Measurement of the axial eye length and retinal thickness by laser Doppler interferometry

A new method based on interferometry methods in conjunction with the laser Doppler technique, using partially coherent light for determining intraocular distances, shows a good agreement also for geometrical distances.

Low-coherence interferometry in ophthalmology

Several intraocular distances -- corneal thickness, anterior chamber depth, lens thickness, axial eye length, and retinal thickness -- were measured with unprecedented precision with a new technique based on interferometry using partially coherent light beams.

In-vivo intraocular ranging by wavelength tuning interferometry

Recently, wavelength tuning interferometry was suggested as an alternative technique for distance measurements. Compared to partial coherence interferometry, it has the advantages of needing no high

Measurement of intraocular distances in human eyes by using Fourier domain low-coherence interferometry

We introduce a system for rapidly measuring the intraocular distances of human eyes in vivo with high sensitivity by using Fourier domain low-coherence interferometry. The system mainly consisting of

Signal and resolution enhancements in dual beam optical coherence tomography of the human eye.

Using a synthesized light source consisting of two spectrally displaced superluminescent diodes with an effective bandwidth of 50 nm, and by compensating for the dispersive effects of the ocular media, it was possible to record the first optical coherence tomogram of the retina of a human eye in vivo with an axial resolution of ∼6 to 7 μm.

Measurements of the posterior structures of the human eye in vivo by partial-coherence interferometry using diffractive optics

In the past ten years, the dual beam version of partial coherence interferometry has been developed for measuring intraocular distances in vivo with a precision on the order of 0.3 to 3 micrometer.

Infrared Optical Path Adjustment Method for Common-Path Optical Coherence Tomography

A new, common-path, in-axis concentric beam-splitting Michelson interferometer is demonstrated for optical coherence tomography (OCT), which can be used to perform high-resolution cross-sectional in

In vivo optical coherence tomography and topography of the fundus of the human eye

Topographic and tomographic scans across the optic disk reveal an increase of thickness of the retinal nerve fiber layer at the inferior and superior rim of the disk, which are in good agreement with results published in the literature.



Corneal thickness measured by interferometry.

An optical method has been developed and has been used to measure corneal thickness in frog and human corneas and a significant capability of this technique is to measure the thickness of optically opaque cornea.

Superposition fringes as a measuring tool in optical testing.

Two possible applications are discussed to some extent: the first deals with the adjustment of air gaps between lenses or other optical elements, and the second is a special spherical Fizeau interferometer, which makes possible surface testing of spheres with the help of interference colors or rings.

Optical and retinal factors affecting visual resolution.

An improved version of the well-known interference fringe technique which theoretically allows a sinusoidal pattern of very high contrast to be formed directly on the retina to be obtained without prior modification by the optics of the eye is reported.

Eye Deformation Measurement By Laser Interferometry

A new interferometric technique to measure deformations of the eye in vivo is described and its application to the diagnosis of glaucoma is discussed.

The Retinal Resolving Power Measured by Laser Interference Fringes

The use of lasers in clinical routine work of ophthalmology is known up to now only for retinal coagulation and this application is presented as a diagnostic tool.

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