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Early detection of glaucoma is important for patients. Many researchers contend that chronic glaucoma selectively damages large optic nerve fibers which arise from M retinal ganglion cells. A subgroup of M cells, My cells, are clearly the most affected. The essential characteristic of My cells is the nonlinear visual responses to flicking sinusoidal gratings, namely 'frequency doubling illusion'. Frequency-doubling technology (FDT) is based on this principle and indicates that My cells function to investigate early-stage glaucoma. Clinical research confirms that frequency-doubling-perimetry not only checks patients quickly and conveniently, but also has high sensitivity and speciality for detecting visual field defects in early-stage glaucoma. LA: Chinese
S. Xuan, Department of Ophthalmology, People's Hospital of Beijing Medical University, Beijing 100044, China
6.6.3 Special methods (e.g. color, contrast, SWAP etc.) (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)