Retinally-induced aniseikonia
... Purpose: To show that retinally-induced aniseikonia may vary as a function of visual field angle (i.e., field-dependent aniseikonia), how this could be explained, and what implications this has for managing the aniseikonia. Design: Observational case series. Method: Self-administration using softwar ...
... Purpose: To show that retinally-induced aniseikonia may vary as a function of visual field angle (i.e., field-dependent aniseikonia), how this could be explained, and what implications this has for managing the aniseikonia. Design: Observational case series. Method: Self-administration using softwar ...
Human Eye - Wiley-VCH
... ends at the iris plane and the eye lens. The iris is a diaphragm of variable diameter, which controls the numerical aperture and the radiance entering the eye. The lens is of a variable shape and changes its refractive power so that the eye can accommodate to an object a certain distance away. The l ...
... ends at the iris plane and the eye lens. The iris is a diaphragm of variable diameter, which controls the numerical aperture and the radiance entering the eye. The lens is of a variable shape and changes its refractive power so that the eye can accommodate to an object a certain distance away. The l ...
Examination of the Patient—III - A global community of learning
... None of the abnormal sensory responses add anything qualitatively new to the act of vision. All abnormal responses of squinters are preformed in the normal act of vision and are perversions or exaggerations of it.33 Thus suppression and, by extension, amblyopia represent a loss of the rhythm of bino ...
... None of the abnormal sensory responses add anything qualitatively new to the act of vision. All abnormal responses of squinters are preformed in the normal act of vision and are perversions or exaggerations of it.33 Thus suppression and, by extension, amblyopia represent a loss of the rhythm of bino ...
Corneal Involvement In A Case Of Mycosis Fungoides
... fungoides. This was first reported by Besnier and Hallopeau in (1892) and histologically confirmed by Herman in 1951. Occasionally this may be the first evidence of the disease, but usually it is seen in well developed cases and occasionally as a terminal event. ...
... fungoides. This was first reported by Besnier and Hallopeau in (1892) and histologically confirmed by Herman in 1951. Occasionally this may be the first evidence of the disease, but usually it is seen in well developed cases and occasionally as a terminal event. ...
Oculomotor Instabilities in Zebrafish Mutantbelladonna
... OKR. The optokinetic system is driven by the global pattern of visual stimulation from which it extracts the magnitude and direction of the velocity relative to the retina (often called retinal slip) to generate an eye movement (OKR) equal in speed and opposite in direction, stabilizing the visual w ...
... OKR. The optokinetic system is driven by the global pattern of visual stimulation from which it extracts the magnitude and direction of the velocity relative to the retina (often called retinal slip) to generate an eye movement (OKR) equal in speed and opposite in direction, stabilizing the visual w ...
Understanding the vitreous
... the largest structure within the eye, our knowledge of its architecture, function and role in disorders of sight is less than that for any other ocular structure. He pointed out that lack of ability to visualise the vitreous, as well as the lack of few effective techniques for its laboratory study, ...
... the largest structure within the eye, our knowledge of its architecture, function and role in disorders of sight is less than that for any other ocular structure. He pointed out that lack of ability to visualise the vitreous, as well as the lack of few effective techniques for its laboratory study, ...
UVEITIS - 2016 SEPTEMBER 15–17, 2016 WESTIN HOTEL
... Dr. Sarraf’s focus of research interest is the dry and wet forms of agerelated macular degeneration (AMD) and specifically the evaluation of pigment epithelial detachment and retinal pigment epithelial tears. He is a leader in advanced retinal imaging and has published extensively in the area of spe ...
... Dr. Sarraf’s focus of research interest is the dry and wet forms of agerelated macular degeneration (AMD) and specifically the evaluation of pigment epithelial detachment and retinal pigment epithelial tears. He is a leader in advanced retinal imaging and has published extensively in the area of spe ...
Bilateral Nerve Alterations in a Unilateral Experimental Neurotrophic
... To study bilateral nerve changes in a newly developed novel mouse model for neurotrophic keratopathy by approaching the trigeminal nerve from the lateral fornix. Surgical axotomy of the ciliary nerve of the trigeminal nerve was performed in adult BALB/c mice at the posterior sclera. Axotomized, cont ...
... To study bilateral nerve changes in a newly developed novel mouse model for neurotrophic keratopathy by approaching the trigeminal nerve from the lateral fornix. Surgical axotomy of the ciliary nerve of the trigeminal nerve was performed in adult BALB/c mice at the posterior sclera. Axotomized, cont ...
Prism Cover Test
... Sometimes it’s difficult to be certain of the end point of neutralizing the turn because of a rebound saccade. Do your best estimation. Positioning of the prism is very important – make certain to hold the prism straight, so you won’t induce a vertical if you’re measuring a purely horizontal deviati ...
... Sometimes it’s difficult to be certain of the end point of neutralizing the turn because of a rebound saccade. Do your best estimation. Positioning of the prism is very important – make certain to hold the prism straight, so you won’t induce a vertical if you’re measuring a purely horizontal deviati ...
Leaflet POAG chronic open angle glaucoma
... eye that provides the blood supply to the cells of the retina and onto which the retina is attached. Light that has passed through the front of the eye and is focussed onto the retina is finally converted into a series of complex electrical impulses by retinal photoreceptor cells known as rods and c ...
... eye that provides the blood supply to the cells of the retina and onto which the retina is attached. Light that has passed through the front of the eye and is focussed onto the retina is finally converted into a series of complex electrical impulses by retinal photoreceptor cells known as rods and c ...
Neuropeptide Y immunoreactive neurons in the guinea
... fibers were found to have the same distribution as noradrenergic fibers except that there were fewer at the iris dilator, in the cornea, and in the chamber angle. In the anterior uvea, the NPY immunoreactive fibers disappeared after excision of the homolateral superior cervical sympathetic ganglion, ...
... fibers were found to have the same distribution as noradrenergic fibers except that there were fewer at the iris dilator, in the cornea, and in the chamber angle. In the anterior uvea, the NPY immunoreactive fibers disappeared after excision of the homolateral superior cervical sympathetic ganglion, ...
Optically induced anisometropia in kittens.
... untreated eyes of the anisometropic kittens and for both eyes of the control kittens, criterion performance was usually established with a 1 cy/deg grating at a 57 cm viewing distance. To determine grating acuity, the staircase was started with the 1 cy/deg target. If the kitten responded correctly ...
... untreated eyes of the anisometropic kittens and for both eyes of the control kittens, criterion performance was usually established with a 1 cy/deg grating at a 57 cm viewing distance. To determine grating acuity, the staircase was started with the 1 cy/deg target. If the kitten responded correctly ...
The complex interactions of retinal, optical and environmental
... Myopia is the commonest ocular abnormality but as a research topic remains at the margins of mainstream ophthalmology. The concept that most myopes fall into the category of ‘physiological myopia’ undoubtedly contributes to this position. Yet detailed analysis of epidemiological data linking myopia ...
... Myopia is the commonest ocular abnormality but as a research topic remains at the margins of mainstream ophthalmology. The concept that most myopes fall into the category of ‘physiological myopia’ undoubtedly contributes to this position. Yet detailed analysis of epidemiological data linking myopia ...
“Decision Making in Glaucoma: When to pull the trigger” COPE
... This regression analysis (Moorfields regression analysis) also compensates for age and identifies glaucomatous eyes with a relatively high level of sensitivity and specificity ...
... This regression analysis (Moorfields regression analysis) also compensates for age and identifies glaucomatous eyes with a relatively high level of sensitivity and specificity ...
Full Vision Correction
... the basis of objective refraction.2 As those cases are usually pre-verbal children, mal-correction might be associated with retarded development of the immature visual system and also might have serious social consequences. Although it is a “routine” procedure, refraction is a very challenging part ...
... the basis of objective refraction.2 As those cases are usually pre-verbal children, mal-correction might be associated with retarded development of the immature visual system and also might have serious social consequences. Although it is a “routine” procedure, refraction is a very challenging part ...
This article was originally published in the Encyclopedia of the Eye
... applied this concept in their measurements and formulated a disability glare formula, which has been widely used. Nowadays, retinal straylight can also be introduced as the outer skirt of the PSF, outside say, 1 . Since retinal straylight is defined in a functional sense by Leq, the comparison with ...
... applied this concept in their measurements and formulated a disability glare formula, which has been widely used. Nowadays, retinal straylight can also be introduced as the outer skirt of the PSF, outside say, 1 . Since retinal straylight is defined in a functional sense by Leq, the comparison with ...
Optics of Astigmatism and Retinal Image Quality
... 2.5 Simulations of the retinal image The retinal image in an astigmatic eye can be simulated using commercially available optical design software. For most purposes, ocular astigmatism can be studied using schematic eyes, which have specific constructional data, Gaussian constants, cardinal points a ...
... 2.5 Simulations of the retinal image The retinal image in an astigmatic eye can be simulated using commercially available optical design software. For most purposes, ocular astigmatism can be studied using schematic eyes, which have specific constructional data, Gaussian constants, cardinal points a ...
Diabetic macular oedema: a comparison of vitreous
... clinical investigations in addition to semiquantitative photographic techniques and measurements of retinal thickness. Previous studies with vitreous fluorometry have shown an increase in passive permeability both in diabetic retinopathy and macular oedema5–7; however, the contribution of retinopath ...
... clinical investigations in addition to semiquantitative photographic techniques and measurements of retinal thickness. Previous studies with vitreous fluorometry have shown an increase in passive permeability both in diabetic retinopathy and macular oedema5–7; however, the contribution of retinopath ...
Binocular disparity can explain the orientation of ocular dominance
... converge before V1, the existence of binocular neurons in V1 (Hubel & Wiesel, 1970) suggests that the information from both eyes is recombined there. Moreover, many binocular neurons in V1 are disparity-tuned (Barlow, Blakemore & Pettigrew, 1967; Poggio & Fischer, 1977; Cumming & Parker, 1999). This ...
... converge before V1, the existence of binocular neurons in V1 (Hubel & Wiesel, 1970) suggests that the information from both eyes is recombined there. Moreover, many binocular neurons in V1 are disparity-tuned (Barlow, Blakemore & Pettigrew, 1967; Poggio & Fischer, 1977; Cumming & Parker, 1999). This ...
Visionary - University of Utah Health Care
... Hatch Presidential Chair in Ophthalmology at the University of Utah. He has been named by the International Society of Eye Research as the recipient of the Houston, Texas-based Retina Research Foundation’s 2014 Paul Kayser International Award in Retina Research. This award recognizes lifetime achiev ...
... Hatch Presidential Chair in Ophthalmology at the University of Utah. He has been named by the International Society of Eye Research as the recipient of the Houston, Texas-based Retina Research Foundation’s 2014 Paul Kayser International Award in Retina Research. This award recognizes lifetime achiev ...
Optic nerve head drusen
... person suffering from the non-arteritic form of AION, patients with optic nerve drusen and AION are younger. They can be in their teens or early adulthood when AION occurs. In addition, these patients do not typically suffer from the usual risk factors seen associated with AION.8,18,20,23,37,58,60–6 ...
... person suffering from the non-arteritic form of AION, patients with optic nerve drusen and AION are younger. They can be in their teens or early adulthood when AION occurs. In addition, these patients do not typically suffer from the usual risk factors seen associated with AION.8,18,20,23,37,58,60–6 ...
Local Coverage Determination for Fundus Photography (L33670)
... vitreous, retina, choroid and optic nerve for diagnostic purposes. These photographs are also used for therapeutic assessment of recently performed retinal laser surgery and to aid in the interpretation of fluorescein angiography. Fundus photography will be covered if accompanied by fluorescein dye ...
... vitreous, retina, choroid and optic nerve for diagnostic purposes. These photographs are also used for therapeutic assessment of recently performed retinal laser surgery and to aid in the interpretation of fluorescein angiography. Fundus photography will be covered if accompanied by fluorescein dye ...
Overview Do you have a client who has been diagnosed with
... The cornea, iris, lens, and pupil surround this chamber, which contains the fluid called aqueous humor. In the back of the anterior chamber is the iris, a thin membrane that gives the eye its color. The opening in the center of the iris is called the pupil, and it appears as a dark circle. By contr ...
... The cornea, iris, lens, and pupil surround this chamber, which contains the fluid called aqueous humor. In the back of the anterior chamber is the iris, a thin membrane that gives the eye its color. The opening in the center of the iris is called the pupil, and it appears as a dark circle. By contr ...
Intravitreal injection of melphalan in the treatment of retinoblastoma
... chemotherapy in Guangzhou Children Hospital, and laser photocoagulation during follow up. In February of 2011, he was found to have vitreous cavity seeding of retinoblastoma and got admitted in our hospital. Ophthalmologic examination: visual acuity: Left eye: 0.1, intraocular pressure (IOP) 12mmHg, ...
... chemotherapy in Guangzhou Children Hospital, and laser photocoagulation during follow up. In February of 2011, he was found to have vitreous cavity seeding of retinoblastoma and got admitted in our hospital. Ophthalmologic examination: visual acuity: Left eye: 0.1, intraocular pressure (IOP) 12mmHg, ...
Glaucoma Workup Review: From A to OCT By: Nathan Rains, OD
... 17 other studies, all different IOP per 100um ...
... 17 other studies, all different IOP per 100um ...
Retina
The retina (/ˈrɛtɪnə/ RET-i-nə, pl. retinae, /ˈrɛtiniː/; from Latin rēte, meaning ""net"") is the third and inner coat of the eye which is a light-sensitive layer of tissue. The optics of the eye create an image of the visual world on the retina (through the cornea and lens), which serves much the same function as the film in a camera. Light striking the retina initiates a cascade of chemical and electrical events that ultimately trigger nerve impulses. These are sent to various visual centres of the brain through the fibres of the optic nerve.In vertebrate embryonic development, the retina and the optic nerve originate as outgrowths of the developing brain, so the retina is considered part of the central nervous system (CNS) and is actually brain tissue. It is the only part of the CNS that can be visualized non-invasively.The retina is a layered structure with several layers of neurons interconnected by synapses. The only neurons that are directly sensitive to light are the photoreceptor cells. These are mainly of two types: the rods and cones. Rods function mainly in dim light and provide black-and-white vision, while cones support daytime vision and the perception of colour. A third, much rarer type of photoreceptor, the intrinsically photosensitive ganglion cell, is important for reflexive responses to bright daylight.Neural signals from the rods and cones undergo processing by other neurons of the retina. The output takes the form of action potentials in retinal ganglion cells whose axons form the optic nerve. Several important features of visual perception can be traced to the retinal encoding and processing of light.