• retina
  • The eye is made up of the sclera, the iris, and the pupil, a black hole located at the center of the eye with the main function of allowing light to pass to the retina. (wikipedia.org)
  • The examinations can determine if any of the muscles of the eye or retina, which is linked to the pupil, have any problems that could relate to the tadpole pupil condition. (wikipedia.org)
  • Dilated Pupillary Exam: special drops expand the pupil, which then allows doctors to examine the retina. (wikipedia.org)
  • The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina. (wikipedia.org)
  • This may be due to the fact that the reflection of one's image in the pupil is a minuscule version of one's self The pupil is a hole located in the centre of the iris of the eye that allows light to strike the retina. (wikipedia.org)
  • The iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. (wikipedia.org)
  • The high pigment content blocks light from passing through the iris to the retina, restricting it to the pupil. (wikipedia.org)
  • Similar to the eyes of other mammals, the human eye's non-image-forming photosensitive ganglion cells in the retina receive light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock. (wikipedia.org)
  • hippus
  • At this stage the pupils do not remain completely still, therefore may lead to oscillation, which may intensify and become known as hippus. (wikipedia.org)
  • Horner's
  • Some patients who demonstrate tadpole pupil symptoms also experienced Horner's syndrome or Adie's tonic pupil Tadpole pupil symptoms occur in episodes. (wikipedia.org)
  • Forearm pronators and wrist flexors may be involved, as may dilators of the iris and elevators of the eyelid (both of which may be seen in the case of associated Horner's syndrome). (wikipedia.org)
  • muscle
  • They then pierce the sclera, travel between sclera and choroid to reach the iris dilator muscle. (wikipedia.org)
  • The iris dilator muscle fibers course radially through the iris. (wikipedia.org)
  • Due to certain muscle spasms in the eye, the pupil can resemble a tadpole, which consists of a circular body, no arms or legs, and a tail. (wikipedia.org)
  • These spasms can affect any segment, or portion, of the iris and involve the iris dilator muscle. (wikipedia.org)
  • Contractions of the iris dilator muscle, a smooth muscle of the eye running radially in the iris, can cause irregular distortion of the pupil, thus making the pupil look tadpole shaped and giving this condition its name. (wikipedia.org)
  • The iris is a contractile structure, consisting mainly of smooth muscle, surrounding the pupil. (wikipedia.org)
  • When this muscle contracts, it reduces the size of the pupil. (wikipedia.org)
  • The reverse is true, so control of pupil size is controlled by differences in contraction intensity of each muscle. (wikipedia.org)
  • It is typically defined as the region where the sphincter muscle and dilator muscle overlap. (wikipedia.org)
  • In mechanical anisocoria, this is the result of damage to the iris dilator muscle, which may be caused by trauma, angle-closure glaucoma, surgery such as cataract removal, or uveitis (inflammation of the eye). (wikipedia.org)
  • Slit lamp examination is often used as a diagnostic aid: damage to the dilator muscle is indicated by anisocoria when light intensity is lowered.Anisocoria refers to a common eye condition in which the two pupils differ in size. (wikipedia.org)
  • A detailed examination of the mydriatic effect of phenylethanolamine led Tainter to conclude that this drug acted by direct stimulation of the radial dilator muscle in the eye. (wikipedia.org)
  • The outer layer is highly pigmented, continuous with the retinal pigment epithelium, and constitutes the cells of the dilator muscle. (wikipedia.org)
  • dilate
  • This System Is Designed To Manually Dilate A Small Pupil With Greater Safety And Efficacy. (bio-medicine.org)
  • Furthermore, the pupil will dilate if a person sees an object of interest. (wikipedia.org)
  • Many fish have neither, and, as a result, their irides are unable to dilate and contract, so that the pupil always remains of a fixed size. (wikipedia.org)
  • cocaine
  • Three tests are useful in confirming the presence and severity of Horner syndrome: Cocaine drop test: Cocaine eyedrops block the reuptake of post-ganglionic norepinephrine resulting in the dilation of a normal pupil from retention of norepinephrine in the synapse. (wikipedia.org)
  • cornea
  • The image of the pupil as seen from outside the eye is the entrance pupil, which does not exactly correspond to the location and size of the physical pupil because it is magnified by the cornea. (wikipedia.org)
  • size
  • In any human age group there is however considerable variation in maximal pupil size. (wikipedia.org)
  • After 25 years of age the average pupil size decreases, though not at a steady rate. (wikipedia.org)
  • As soon as the eye moves rapidly to acquire a target (saccades), it re-adjusts its exposure by adjusting the iris, which adjusts the size of the pupil. (wikipedia.org)
  • circular
  • The iris is the pigmented circular structure concentrically surrounding the center of the eye, the pupil, which appears to be black. (wikipedia.org)
  • humans
  • In humans the pupil is round, but other species, such as some cats, have vertical slit pupils, goats have horizontally oriented pupils, and some catfish have annular types. (wikipedia.org)
  • light
  • When stimulated, the cells contract, widening the pupil and allowing for more light to pass through the eye. (wikipedia.org)
  • It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. (wikipedia.org)
  • The pupil gets wider in the dark and narrower in light. (wikipedia.org)
  • It is particularly noticeable when pupil function is tested with a light, but is independent of eye movements or changes in illumination. (wikipedia.org)
  • apparent
  • Studies show that a majority of those experiencing tadpole pupil are younger women from an age range of 24 to 48 years old, with no apparent health problems. (wikipedia.org)
  • condition
  • When the pupil takes on the shape of a tadpole, the condition is called tadpole pupil. (wikipedia.org)
  • These tests include pharmacological testing (testing for an effective drug against a specific disease or condition), a complete ocular examination (a test that examines the entire eye), and video pupillography (recording and analysis of spontaneous pupil behavior in darkness). (wikipedia.org)