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ILLUSION. A species of mania in which the sensibility of the nervous system is altered, excited, weakened or perverted. The patient is deceived by the false appearance of things, and his reason is not sufficiently active and powerful to correct the error, and this last particular is what distinguishes the sane from the insane. Illusions are not unfrequent in a state of health, but reason corrects the errors and dissipates them. A square tower seen from a distance may appear round, but on approaching it, the error is corrected. A distant mountain may be taken for a cloud, but as we approach, we discover the truth. To a person in the cabin of a vessel under sail, the shore appears to move; but reflection and a closer examination soon destroy this illusion. An insane individual is mistaken on the qualities, connexions, and causes of the impressions he actually receives, and he forms wrong judgments as to his internal and external sensations; and his reason does not correct the error. 1 Beck's Med. Jur. 538; Esquirol, Maladies Mentales, prem. partie, III., tome 1, p. 202. Dict. des Sciences Medicales, Hallucination, tome 20, p. 64. See Hallucination.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
Sensitivity advantage of swept source and Fourier domain optical coherence tomography. Opt Express.
Study of Retinal Nerve Fibre Layer Thickness in Patients with Diabetes Mellitus Using Fourier Domain Optical Coherence Tomography. J Clin Diagn Res.
Estimating retinal nerve fiber layer thickness in normal schoolchildren with spectral-domain optical coherence tomography. J pn J Ophthalmol 2012;56:362-70.
Glaucoma detection ability of ganglion cell-inner plexiform layer thickness by spectral-domain optical coherence tomography in high myopia.
Association of retinal nerve fibre layer thickness measured by confocal scanning laser ophthalmoscopy and optical coherence tomography with disc size and axial length.
(14.) Almobarak FA, O'Leary N, Reis AS, Sharpe GP, Hutchison DM, Nicolela MT, Chauhan BC Automated Segmentation of Optic Nerve Head Structures With Optical Coherence Tomography Invest Ophthalmol Vis Sci.
Use of optical coherence tomography to assess variations in macular retinal thickness in myopia.
Spectral-domain optical coherence tomography and adaptive optics may detect hydroxychloroquine retinal toxicity before symptomatic vision loss.
Miller, "Distinguishing white dot syndromes with patterns of choroidal hypoperfusion on optical coherence tomography angiography," Ophthalmic Surgery, Lasers and Imaging Retina, vol.
Eter, "Flow density measurements using optical coherence tomography angiography: impact of age and gender," Ophthalmologe, 2017.
Inami et al., "Appearance of lipid-laden intima and neovascularization after implantation of bare-metal stents: extended late-phase observation by intracoronary optical coherence tomography," Journal of the American College of Cardiology, vol.
To better enhance image details and layered structures of noisy optical coherence tomography (OCT) image, we propose a collaborative shock filtering for OCT image denoising and enhancement.

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