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Visual Fields by Robert P. Cubbidge

By Robert P. Cubbidge

Eye necessities is a brand new sequence of texts which gives authoritative and obtainable details for all eye care pros, even if in education or in perform. each one pocket advisor is either a speedy evaluate device for college students and a convenient scientific reference advisor for practitioners. With positive aspects corresponding to tables, key bullet issues, medical pearls, perform pitfalls, summaries, motion icons and wonderful complete colour illustrations, this sequence has swiftly validated itself as a great resource of crucial details for trendy readers.

  • Practical counsel that's facts based
  • Full-color illustrations make clear key information
  • Highlighted suggestion sections for sufferers and convenient tables throughout
  • Authoritative counsel on visible fields from a revered chief within the field
  • Provides crucial details in a single handy overview source

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Extra resources for Visual Fields

Sample text

Sensitivities are greatest in the central visual field and exhibit a gradual decline towards the visual field periphery, reflecting the shape of the hill of vision. A decibel value of 0 dB indicates detection of the brightest light stimulus the perimeter is able to generate. A value of < 0 dB indicates that the patient was unable to detect the maximum stimulus luminance (differing between perimeters but typically in the order of 10,000 asb), but this does not necessarily mean that the patient has no light perception in that region of the visual field.

1 Appearance of a nasal step with kinetic perimetry Analysis of full threshold static perimetry Analysis of suprathreshold static perimetry The visual field plot from suprathreshold perimetry usually consists of a series of dots or circles, indicating the stimulus locations tested during the visual field examination, and a numerical value showing the threshold level of the patient from which the suprathreshold level was set. Dots or open circles indicate that the patient observed the suprathreshold stimulus, whereas a closed circle indicates that the patient was unable to detect the stimulus.

This may 45 Clinical assessment of fields 46 be due to the presence of a visual field defect, but could also be due to poor concentration. It is a prudent procedure to go back to missed locations later in the examination and re-present the stimulus configuration. Often, shallow and isolated defects will disappear and enhance the final visual field interpretation. During the course of a single stimulus suprathreshold or a full threshold visual field examination, a number of vigilance criteria are automatically assessed by the perimeter; namely, fixation losses and false negative and positive responses.

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