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Chapter-05 New Investigations in Glaucoma

BOOK TITLE: Surgical Techniques in Ophthalmology: Glaucoma Surgery

Author
1. Dada Tanuj
2. Bhartiya Shibal
3. Vengayil Sujith
ISBN
9788184489583
DOI
10.5005/jp/books/11383_5
Edition
1/e
Publishing Year
2010
Pages
20
Author Affiliations
3. Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India, Dr RP Centre, AIIMS, New Delhi, Clinical Ophthalmology, Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, Ansari Nagar New Delhi, India, Clinical Ophthalmology, Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India, Dr RP Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India, Dr RP Center for Ophthalmic Sciences, AIIMS, Ansari Nagar, New Delhi, India, Dr RP Centre for Ophthalmic Sciences, AIIMS, Ansari Nagar New Delhi 110 029, India, Dr Rajendra Prasad Center for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India, Dr RP Centre for Ophthalmic Sciences, AIIMS, Ansari Nagar, New Delhi-110029, India
Chapter keywords
Frequency Doubling Technology (FDT) perimeter, Optical coherence tomography (OCT), low coherence interferometry, optical biopsy, ultrasound biomicroscopy, retinal nerve fiber layer analysis, scanning laser polarimetry

Abstract

This chapter discusses new investigations in glaucoma. Frequency Doubling Technology (FDT) perimeter uses a large low spatial frequency sinusoidal grating that consists of black and white bars undergoes a rapid counter phase flicker leading to a frequency doubling illusion in which, at a certain level of contrast, the number of visible lines appears to double. Optical coherence tomography (OCT) is a cross-sectional, three-dimensional, high-resolution imaging modality that uses low coherence interferometry to achieve a high axial resolution ranging from 10–20µm, “optical biopsy”. Ultrasound biomicroscopy is explained. Retinal nerve fiber layer analysis using scanning laser polarimetry is described.

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