Purkinje-Sanson image's Catoptric images produced by reflection from the optical surfaces of the eye. Perceptual image psychic image See visual image. The image formed by the refracting system of the eye, disregarding the presence or the position of the retina. Inverted image Image that is upside down and right for left with respect to its object. Indirect image A real image, such as the inverted image seen in indirect ophthalmoscopy. See Fresnel's formula lens flare stray light front surface mirror. The faint image seen in monocular diplopia. The intensity of ghost images is diminished by antireflection coatings. These images are sometimes annoying to spectacle wearers, and even to observers as they detract from the appearance of the spectacle lens or hide the wearer's eyes behind a veil. Unwanted image as may be formed by internal reflection in a lens or an optical system. It is less well defined than the true image. The retinal image in the deviating eye in strabismus. See Purkinje-Sanson images.įalse image 1. See angioscotoma blue arcs blue field entoptoscope floaters Haidinger's brushes Maxwell's spot.Įrect image Image that is not inverted with respect to the object such as a virtual image produced by a concave lens. That image may last from a few seconds to several minutes and appears to be located in front of the eyes.Įntoptic image Visual sensation arising from stimuli within the eye and perceived as in the external world. They are also called the first and second Purkinje-Sanson images.ĭioptric image An image formed by a refracting surface as distinguished from a catoptric image.ĭirect image A virtual image such as the erect image seen in direct ophthalmoscopy.ĭouble image A pair of images obtained either optically through a doubling system or due to diplopia.Įidetic image Visual perception arising from the imagination of the subject or what has previously been seen, and not from immediate retinal stimulation. See catadioptric system.Ĭatoptric image Image formed by specular reflection, either from a mirror or by reflection at refracting surfaces such as the optical surfaces of the eye, which form the Purkinje-Sanson images.Ĭorneal image Catoptric image formed by either the anterior or posterior surface of the cornea. See object image plane.Īerial image An image found in space and not on a screen, such as the image viewed in indirect ophthalmoscopy.Īxial point image The point of intersection of an image with the optical axis.Ĭatadioptric image Image formed by both reflecting and refracting surfaces. A picture of an object formed by a lens, a mirror or other optical system.
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