page_title: Van Herick technique
section_title: Equipment
hierarchical_section_title: Van Herick technique / Equipment
caption_attribution_description: English: Labelled Image of the Slit Lamp On/off switch Illumination Joystick Handles for patient Alcohol swabs Eyepieces Forehead rest Chin rest Filter Changing Knob Slit beam length knob Slit beam width knob
context_page_description: The Van Herick technique is an eye examination method used to determine the size of the anterior chamber angle of the eye.
  Glaucoma is currently the principal cause of irreversible blindness in the world. Therefore, The Van Herick technique is pertinent to the interests of all eye care practitioners as it permits for a quick and simple screening alternative to the conventional Gonioscopy examination. It should not however, be used as a replacement for the gonioscopy examination but rather be used as a means of refuting or confirming the results of a gonioscopy examination.
  The Van Herick's technique has become the most commonly used qualitative method of assessing the size of the anterior chamber angle. Whereby, it involves comparing the depth of the peripheral anterior chamber to the thickness of the cornea, when a narrow beam is shone within the limbus at a 60°angle. The anterior chamber drainage angle is then graded as a ratio between the peripheral anterior chamber depth and corneal thickness or expressed traditionally as a fraction to provide the Van Herick's result. Grading can also be obtained by distinguishing the structures visible upon observation.
context_section_description: Slit lamp biomicroscope (settings: High rheostat illumination, Medium magnification (10–16×) 2
  Alcohol swabs: Used to maintain hygiene for the patient
caption: Labelled image of slit lamp: On/off switchIlluminationJoystickHandles for patientAlcohol swabsEyepiecesForehead restChin restFilter Changing KnobSlit beam length knobSlit beam width knob
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