Humphrey Visual Field

    Humphrey Visual Field Machine

    The Humphrey Visual Field test is a subjective measure of functional vision. By shining small pinpricks of light on the retina it is possible to determine regions where light is detected and regions where it is not.

    Software features: Guided Progression Analysis (GPA): identifies statistically significant progression; Visual Field Index (VFI): a global index to determine the percentage of field loss; Glaucoma Hemifield Test (GHT): a measure of whether a visual field test is within or outside of the normal limits expected for an age matched population

    The testing output of a single visual field test (left), and the guided progression analysis (GPA) of a progressing patient (right)

     

     

    Cirrus OCT

    Cirrus OCT

    The Cirrus OCT is the main source of structural data for clinicians. The Cirrus OCT quickly scans regions such as the optic nerve, macula, and anterior segment, giving 3D analyses in seconds and reporting reliable and easily comparable tissue thickness measurements and glaucoma progression analysis. The software also includes an analysis of the ganglion cell complex, which can provide more information about potential glaucomatous damage when the optic nerve and RNFL analyses prove inconclusive.

    Optic nerve and RNFL analysis, total macular thickness analysis, and ganglion cell thickness analysis (top row). Guided progression analysis (GPA) of a progressing patient (bottom row)

     

     

    Spectralis OCT

    Spectralis OCT

    Clinicians that specialize in retinal pathologies primarily use the Spectralis OCT. This OCT gives the highest resolution images of any commercial OCT. Features include eye tracking, motion correction, fluorescein angiography indocyanine green angiography, and autofluorescence.

    Optic nerve and RNFL analysis (left), and total macular thickness analysis (right)

     

     

    Prototype OCT Systems

    Swept Source (SS)-OCT

    The swept source OCT scans very quickly using scan patterns that are customizable. SS-OCT scans suffer from less signal attenuation than commercial devices, allowing deeper structures to be imaged with this technology.

    SS-OCT cross-section of the optic nerve head

    Specifications:

    Methodology: Spectral domain OCT

    Optical source: Superluminescent diode (SLD), 1050 nm

    Scan speed: 27,000 A-scans per second

    Axial resolution: 5 μm (in tissue)

    Transverse resolution: 18μm (in tissue)

     

     

    Adaptive Optics (AO)-OCT

    AO-OCT is a multimodal retinal imaging system with adaptive optics that includes several different technologies including SD-OCT, confocal scanning laser ophthalmoscopy, and a line scanning ophthalmoscope.

    AO-OCT fundus image

    Specifications:

    Methodology: Spectral domain OCT

    Optical source: Superluminescent diode (SLD), 1050 nm

    Scan speed: 100,000 A-scans per second

    Axial resolution: 4.5μm (in tissue)

    Transverse resolution: 5μm (in tissue)

     

     

    Visible light (vis)-OCT

    vis-OCT is a very new form of OCT technology that utilizes the visible light spectrum to capture images of the retina.

     

     

    Stratus OCT

    RTVue OCT

    Heidelberg Retinal Tomography (HRT): confocal scanning laser ophthalmoscope (CSLO)

    GDx Pro: scanning laser polarimetry (SLP)

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