Article

Polarimetric high-resolution confocal scanning laser ophthalmoscope.

Laboratorio de Optica, Departamento de Física, Universidad de Murcia, Campus de Espinardo (Edificio C), Spain.
Vision Research (Impact Factor: 2.38). 01/2006; 45(28):3526-34. DOI: 10.1016/j.visres.2005.08.008
Source: PubMed

ABSTRACT A polarimetric high-resolution confocal scanning laser ophthalmoscope has been developed. The system incorporates a fixed linear polarizer in the illumination path and a rotatory quarter-wave plate and another fixed linear polarizer in the registration path. Retinal areas that are smaller than those provided by commercial instruments can be imaged. Series of four fundus images for independent polarization states in the second pass were recorded for different eyes and retinal locations and the spatially resolved Stokes vectors calculated. From those images, the contrast across retinal blood vessels was maximized and the corresponding image was reconstructed. In terms of polarization, the analysis of small retinal areas might prove to be useful in the improvement of retinal imaging and the enhancement of structural details in the early diagnosis of ocular pathologies.

0 Bookmarks
 · 
120 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A double-pass imaging polarimeter has been used to compute the central corneal birefringence axis and retardation in a group of 22 eyes of different ages. Sets of four retinal images corresponding to independent polarisation states in the analyser unit were recorded. From the intensities at the image central area the corneal polarimetric parameters were computed using the Stokes–Mueller formalism. Although the (slow) axis of the central cornea presented individual differences, it was mostly lying along the nasal-downward direction. Corneal retardation also presented a broad distribution. Neither the axis nor the retardation was correlated with age. There was a significant correlation between age and the intensity at the central area of the images. This technique might be a useful tool when combined with clinical instruments oriented to glaucoma detection, which include corneal compensation for polarimetric retinal imaging.
    Journal of Modern Optics 11/2011; 58(19-20):1-7. DOI:10.1080/09500340.2011.568707 · 1.17 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The average amount of ocular diattenuation was studied using a double-pass polarimeter. This was directly computed from the central part of the elements of the first row of the Mueller matrix obtained from a series of 16 double-pass retinal images. For a 633 nm wavelength, the results show that the parameter is 0.10, on average. Axes of diattenuation are particular for each subject and differ from those associated with ocular birefringence. Moreover, polarization states providing maximum ocular intensity transmittance are in general elliptically polarized.
    Journal of Modern Optics 01/2008; 55:849-859. DOI:10.1080/09500340701467850 · 1.17 Impact Factor

Full-text (2 Sources)

Download
55 Downloads
Available from
Jun 1, 2014