How does a scanning laser ophthalmoscope work?

SLO utilizes horizontal and vertical scanning mirrors to scan a specific region of the retina and create raster images viewable on a television monitor. While it is able to image the retina in real time, it has issues with reflections from eye astigmatism and the cornea.

What is laser tomography?

Confocal Scanning Laser Tomography is a robust, sophisticated diagnostic technique which produces 3-dimensional laser scan images of the optic nerve head and gives three dimensional cross-sectional images of the retina.

What is confocal scanning laser ophthalmoscopy?

Confocal scanning laser ophthalmoscopy is a non–invasive investigation that has been used initially to receive three–dimensional images of the retinal surface in vivo. The commercial name of the device is Heidelberg Retina Tomograph (HRT).

How does Heidelberg retinal tomography work?

The HRT uses a special laser to take 3-dimensional photographs of the optic nerve and surrounding retina. This laser, which will not harm the eye, is focused on the surface of the optic nerve and captures the image. The HRT takes images of deeper and deeper layers until the desired depth has been reached.

When using the ophthalmoscope it is best to?

Place your left hand on the patient’s head and place your thumb on their eyebrow. Hold the ophthalmoscope about 6 inches from the eye and 15 degrees to the right of the patient. Find the red reflex. Move in closer, staying nasally until you see the optic nerve.

What is Slo in ophthalmology?

Confocal scanning laser ophthalmoscopy (SLO) [84] scans the retina with a point of light moving in a raster pattern and detects the reflected light in a confocal process that allows the reconstruction of a three-dimensional image of the retina.

How does OCTA work?

OCTA works by detection of erythrocyte motion, so any extraneous movement during the image-capturing process may result in motion artifacts, which appear as white or black lines in the flow angiograms, and/or misalignment of the retinal vasculature.

What does CSLO stand for?

CSLO

What is a tomographic image?

1 Introduction. ¯ Tomography is a non-invasive imaging technique allowing for the visualization of the internal structures of an. object without the superposition of over- and under-lying structures that usually plagues conventional projection images.

What is the difference between OCT and HRT?

OCT (Optical Coherence Tomography) detects damage of only the nerve fibre layer. HRT (Heidelberg Retina Tomography) looks at changes in the topography of the optic nerve – like looking at the erosion of a mountain.

What is laser polarimetry used for?

Scanning laser polarimetry. A scanning unit in this instrument is used to move the beam horizontally and vertically on the retina. The focused beam is 35μm in diameter. This instrument also has a polarization detector. It is used to detect polarized light that is reflected back from the cornea.

What is retinal scanning laser polarimetry?

In Retinal scanning laser polarimetry (SLP), the cornea, lens, and retina are all treated as linear retarders (optical elements that introduce retardation to an illuminating beam).

What is linear retardation in laser polarimetry?

The amount of retardation of light reflected from the fundus is converted to RNFL thickness. In Retinal scanning laser polarimetry (SLP), the cornea, lens, and retina are all treated as linear retarders (optical elements that introduce retardation to an illuminating beam).

What is confocal scanning laser polarimetry?

The principle of confocal scanning laser polarimetry is to illuminate the optic nerve and retina through a single pinhole and to allow light that returns from the point of interest to pass through the pinhole and be detected.