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.
Multiple-wavelength partial coherence interferometry
We report on the possibility to reduce the coherence length and therefore improve the longitudinal resolution of partial coherence interferometry by an incoherent superposition of two spectrally
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.
Depth-resolved measurement of ocular fundus pulsations by low-coherence tissue interferometry.
A device that allows for the measurement of ocular fundus pulsations at preselected axial positions of a subject's eye is presented and the applications may be wide, including assessment of eye elongation during myopia development and blood-flow-related changes in intraocular volume.


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.
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.
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.
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