Kinetic Perimetry

Kinetic Perimetry - Power point copy of talk nd presented...

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24 December 2011 Prof Sanjay Shrivastava 1 Power point copy of talk presented at 32 nd M.P. State Ophthalmic Conference held from 17 th to 19 th October 2008 at Ujjain
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Kinetic Perimetry Dr Sanjay Shrivastava Professor of Ophthalmology Regional Institute of Ophthalmology Gandhi Medical College, Bhopal drs.rio@hotmail.com www.eyeeducation.org
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24 December 2011 Prof Sanjay Shrivastava 3 Visual Field The Normal visual field is depicted as Traquair’s “Island of vision surrounded by a sea of blindness” The three dimensional concept can be reduced to quantitative values by plotting lines (isopters) at various levels around the island or by measuring the height (sensitivity) at different points within the island of vision.
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24 December 2011 Prof Sanjay Shrivastava 4 Visual Field The normal visual field and glaucomatous changes in visual field are the same as when Bjerrum discovered the arcuate scotoma using back of his consulting room door as a background for testing visual field nearly 110 years ago. Advances in the technology of visual field testing are changing our perception of normal and abnormal visual fields.
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24 December 2011 Prof Sanjay Shrivastava 5 Influence of Glaucoma on Visual Function o Understanding about natural history of progressive visual field loss is continuously increasing with newer instruments and technologies which has increased the sensitivity of test o The visual field defects that are caused by loss of retinal nerve fiber bundles are the most common and familiar change, the central vision is typically one of the last region to be lost
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24 December 2011 Prof Sanjay Shrivastava 6 Influence of Glaucoma on Visual Function o Studies have shown that mild central and diffuse reduction in the visual field can occur even in early stage of glaucoma
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24 December 2011 Prof Sanjay Shrivastava 7 Visual Field defects in Glaucoma o Concentric contraction o Enlargement of blind spot o Angioscotoma o Nerve fiber bundle defects: a. Scatter (fluctuation/localized minor disturbances): they are variable threshold responses to repeated testing in the same area. Scatter is studied with differential light threshold. It is considered early warning sign of glaucoma
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24 December 2011 Prof Sanjay Shrivastava 8 Visual Field defects in Glaucoma b. Arcuate defect c. Nasal step d. Vertical step e. Temporal sector defect
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24 December 2011 Prof Sanjay Shrivastava 9 Other Conditions Affecting Visual Field Neurological Disorders Retinal Diseases including pigmentary dystrophies and vascular diseases
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24 December 2011 Prof Sanjay Shrivastava 10 Advanced Glaucomatous Field Defects o Complete double arcuate scotoma with extension to peripheral limits in all areas except temporally o This results in a central island and a temporal island of vision in advanced glaucoma
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24 December 2011 Prof Sanjay Shrivastava 11 Other Measures of Visual Impairment in Glaucoma
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24 December 2011 Prof Sanjay Shrivastava 12 Other Measures 1. Colour vision 2. Contrast sensitivity
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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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Kinetic Perimetry - Power point copy of talk nd presented...

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