Perimetry by dr.ricky
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This document summarizes a seminar on assessing the visual field using automated perimetry. It defines key terminology used in visual field testing like threshold, apostilbs, decibels, and indices. It describes the components and functioning of the Humphrey Field Analyzer automated perimeter. It provides criteria for diagnosing glaucoma based on visual field tests and categorizes the severity of visual field defects as early, moderate, or severe. It also outlines how to recognize progressive damage by comparing tests over time.
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2) Key steps include controlling accommodation, finding the monocular best sphere using VA or bichrome tests, and determining the cylindrical component using fogging with targets like clock dials or Jackson cross cylinders.
3) The axis of the cylindrical correction must match the axis of the patient's astigmatism to fully correct their refractive error.
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- Visual field examination tests the peripheral sensitivity of the retina and visual pathways. It is important for assessing topographic sensitivity and detecting visual field defects.
- Automated perimetry provides standardized, quantitative tests to measure threshold sensitivity across the visual field. It allows for reliable long-term monitoring to detect glaucomatous progression.
- Interpretation of visual field tests involves analyzing parameters like total deviation plots, pattern deviation plots, and global indices to identify patterns indicative of glaucoma according to established criteria. Clinical correlation with optic nerve examination is also important.
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Contrast sensitivity refers to the ability to see objects that have low contrasts or do not stand out clearly from their backgrounds. It is measured using charts with different spatial frequencies and contrast levels to determine the minimum contrast needed to see a target. Contrast sensitivity is affected by many eye diseases and conditions more subtly than visual acuity and can provide early detection of problems. It is tested using various charts like Pelli-Robson, Cambridge Low Contrast Gratings, and Functional Acuity Contrast Testing (FACT) that evaluate contrast sensitivity levels at different spatial frequencies.
Visual field examination
This document discusses the visual field and visual field testing. It defines the visual field as the part of the environment that can be detected by a steady eye. It then discusses the physiological basis of the visual field and factors that can affect visual field testing results, such as stimulus characteristics and patient factors. The document also summarizes different types of visual field defects and explains common perimetry techniques and their advantages. It provides details on visual field test interpretation, including reliability indices, total and pattern deviation plots, and classification of results.
Basic approach on hvf
This document provides an overview of Humphrey visual field (HVF) testing. HVF uses static perimetry to measure threshold sensitivity values across the visual field and compare them to normative data. It uses white stimuli on a white background presented for 0.2 seconds. Common testing programs include 30-2, 24-2, and 10-2 patterns. The results are analyzed using global indices, total and pattern deviation plots, and the Glaucoma Hemifield Test. Test quality must be ensured through reliability indices and proper patient preparation. Visual field defects are evaluated based on probability plots and Anderson's criteria to determine if they are outside normal limits. Progression is monitored by frequent testing, especially if mean deviation is changing
Visual field assessment,optic nerve changes and retinal changes
This document discusses visual field assessment and changes related to glaucoma in the optic nerve and retina. It defines key terms like visual field, isopters, and scotomas. It describes different types of visual field defects seen in glaucoma like arcuate defects, nasal steps, and generalized depression. It also discusses optic nerve head anatomy and the effects of increased intraocular pressure on the lamina cribrosa and retinal ganglion cell axons. Different techniques for visual field testing like kinetic, static, and threshold perimetry are summarized along with reliability indices.
Visual Field in Glaucoma
The document discusses visual field testing in glaucoma. It defines the visual field and perimetry, and describes the major types of clinical perimetry tests including full threshold, SITA standard, and SITA fast on Humphrey and normal, dynamic, and TOP strategies on Octopus. It explains parameters such as test patterns, reliability, age-corrected plots, tests like GHT and Bebie curve, and global indices including MD, PSD, SF, and CPSD. The purpose of visual field testing in glaucoma is to detect and monitor disease by measuring light sensitivity across the retinal field.
Humphrey visual field analyser (HVFA)
To know Humphrey visual field analyser
To know about various types of perimetry
To identify field defect
To recognize that field defect is due to glaucoma or neurological lesion
To know that field defect is progressive or not
Interpretation of HVFA
classification and management of glaucoma.pptx
This document discusses the classification and management of glaucoma. It begins by defining glaucoma as a condition caused by intraocular pressure that is detrimental to the eye and can lead to visual field changes and optic nerve damage. Intraocular pressure reduction is the only modifiable factor that can arrest or prevent glaucoma progression. The document then describes the layers of the optic nerve, defines visual fields, and lists criteria for typical glaucomatous visual field defects. It also discusses glaucoma in specific conditions like myopia, after LASIK, and with increased episcleral venous pressure. The management of glaucoma involves evaluating the intraocular pressure, gonioscopy, OCT, visual fields, and optic nerve
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