Management of Pseudophakic Retinal Detachment
... Material and Methods: Non comparative interventional case study was conducted at Isra Postgraduate Institute of Ophthalmology, Al-Ibrahim Eye Hospital, Malir Karachi from 1st January to December 2005. Study include 23 pseudophakic eyes of 23 patients with pseudophakic retinal detachment, who underwe ...
... Material and Methods: Non comparative interventional case study was conducted at Isra Postgraduate Institute of Ophthalmology, Al-Ibrahim Eye Hospital, Malir Karachi from 1st January to December 2005. Study include 23 pseudophakic eyes of 23 patients with pseudophakic retinal detachment, who underwe ...
Matherly, K
... Initially, MRI of the brain did not show enhancement of the left optic nerve, which was unexpected. MRI of the orbit was needed to visualize the small, subtle enhancement of the left intraorbital optic nerve. The minimal enhancement in the setting of profound vision loss suggested the possibility of ...
... Initially, MRI of the brain did not show enhancement of the left optic nerve, which was unexpected. MRI of the orbit was needed to visualize the small, subtle enhancement of the left intraorbital optic nerve. The minimal enhancement in the setting of profound vision loss suggested the possibility of ...
Chapter 16
... As it slowly progresses, the streaks extend to the center and interfere with light passing through the nucleus Both distance and near vision can be impaired Patients also have problems with glare and loss of contrast ...
... As it slowly progresses, the streaks extend to the center and interfere with light passing through the nucleus Both distance and near vision can be impaired Patients also have problems with glare and loss of contrast ...
Cannabis and glaucoma - The inside story
... associated risk factors, such as Type 2 diabetes or dyslipidaeamia. But this was the first of what may turn into a rush. In the last year or two, cannabinoid receptors have been found to underpin several utterly unexpected diseases, including osteoporosis, atherosclerosis and Parkinson's disease, as ...
... associated risk factors, such as Type 2 diabetes or dyslipidaeamia. But this was the first of what may turn into a rush. In the last year or two, cannabinoid receptors have been found to underpin several utterly unexpected diseases, including osteoporosis, atherosclerosis and Parkinson's disease, as ...
Asteroid hyalitis (Benson`s disease) and
... authors have noted 75 per cent. unilaterality of the disease, but two (Hogan and Zimmerman, I962; Cibis, I965) claimed 75 per cent. bilaterality without detailed documentation. It is difficult to discount as fortuitous the occurrence of asteroid hyalitis and retinal separation in five patients. It i ...
... authors have noted 75 per cent. unilaterality of the disease, but two (Hogan and Zimmerman, I962; Cibis, I965) claimed 75 per cent. bilaterality without detailed documentation. It is difficult to discount as fortuitous the occurrence of asteroid hyalitis and retinal separation in five patients. It i ...
- Optometric Extension Program Foundation
... There is evidence of biochemical communication from the bipolar or amacrine cells in the retina through the retinal pigment epithelium (RPE) and choroid to the sclera by means of neurotransmitters or growth factors.44 Here, enzyme levels may regulate the synthesis of the scleral extracellular matrix ...
... There is evidence of biochemical communication from the bipolar or amacrine cells in the retina through the retinal pigment epithelium (RPE) and choroid to the sclera by means of neurotransmitters or growth factors.44 Here, enzyme levels may regulate the synthesis of the scleral extracellular matrix ...
Ophthalmic Imaging - an Overview and Current State of Art: Part I
... Figure 8. Monochromatic fundus photograph taken with blue-green light (peak transmission at 490nm). The lack of specular reflections in the dark, wedge-shaped areas identify a loss of retinal nerve fibers from glaucoma. ...
... Figure 8. Monochromatic fundus photograph taken with blue-green light (peak transmission at 490nm). The lack of specular reflections in the dark, wedge-shaped areas identify a loss of retinal nerve fibers from glaucoma. ...
Stemming vision loss with stem cells
... cell division, and, under certain physiological or experimental conditions, they can be induced to become tissue- or organ-specific cells with special functions (1). Stem cells can be derived and/or obtained from tissues of early embryos or adults and, under appropriate conditions, will differentiat ...
... cell division, and, under certain physiological or experimental conditions, they can be induced to become tissue- or organ-specific cells with special functions (1). Stem cells can be derived and/or obtained from tissues of early embryos or adults and, under appropriate conditions, will differentiat ...
OPTIC NERVE DISEASE
... nerve: Optic neuritis, Anterior Ischemic Optic Neuropathy (ischemic and nonischemic) ...
... nerve: Optic neuritis, Anterior Ischemic Optic Neuropathy (ischemic and nonischemic) ...
General Objectives: 1. Describe basic tenets of the fundamentals of
... 2. List differences between the retinal and choroidal circulations 3. Explain why acuity is much higher in the fovea than anywhere else on the retina 4. Explain why the cornea and lens are transparent 5. Explain how you could non-invasively examine the function of photoreceptors, bipolar cells, gang ...
... 2. List differences between the retinal and choroidal circulations 3. Explain why acuity is much higher in the fovea than anywhere else on the retina 4. Explain why the cornea and lens are transparent 5. Explain how you could non-invasively examine the function of photoreceptors, bipolar cells, gang ...
MD0805 5-1 LESSON ASSIGNMENT LESSON 5 Review of Ocular
... lens. The fovea centralis is found in a small yellow area of the retina called the macula lutea. The macula lutea is the area of the retina where vision is the sharpest. ...
... lens. The fovea centralis is found in a small yellow area of the retina called the macula lutea. The macula lutea is the area of the retina where vision is the sharpest. ...
EYE EXAMINATION
... •Ask pt to fix gaze on a spot on the wall •From about 15” away and about 15o lateral look into pt’s eye •Observe the red reflex and then move in closer •You may rest your opposite hand on the pt’s forehead above the eye to help guide •Move the opthalmoscope very close to the pt’s eye •If you initial ...
... •Ask pt to fix gaze on a spot on the wall •From about 15” away and about 15o lateral look into pt’s eye •Observe the red reflex and then move in closer •You may rest your opposite hand on the pt’s forehead above the eye to help guide •Move the opthalmoscope very close to the pt’s eye •If you initial ...
Blouin (2004) Shifts in the retinal image of a visual scene during
... initial visual environment (i.e. the 08 –128 –368 set of LEDs) could be shifted by 4.58 to the right when peak velocity of the primary saccade was reached (see Fig. 2 for typical raw recordings in this condition). In this case, after the visual scene displacement, the subjects were facing an environ ...
... initial visual environment (i.e. the 08 –128 –368 set of LEDs) could be shifted by 4.58 to the right when peak velocity of the primary saccade was reached (see Fig. 2 for typical raw recordings in this condition). In this case, after the visual scene displacement, the subjects were facing an environ ...
Problems Caused by Angioid Streaks
... Our eyes are comprised of many different structures and membranes. The back of each eye houses the retina, a tissue that contains layers of cells and enables us to sense light. Within this area is a thin, multi-layered elastic tissue known as the Bruch’s membrane, which preserves the blood-ocular ba ...
... Our eyes are comprised of many different structures and membranes. The back of each eye houses the retina, a tissue that contains layers of cells and enables us to sense light. Within this area is a thin, multi-layered elastic tissue known as the Bruch’s membrane, which preserves the blood-ocular ba ...
pdf
... history of Wegener's granulomatosis with posterior scleritis. There are bilateral episcleral fluid collections with distortion of the globes likely due to scleral degeneration or necrosis. Corresponding fundoscopy (b) and a photograph (c) show engorged scleral vessels. Additional fundoscopic images ...
... history of Wegener's granulomatosis with posterior scleritis. There are bilateral episcleral fluid collections with distortion of the globes likely due to scleral degeneration or necrosis. Corresponding fundoscopy (b) and a photograph (c) show engorged scleral vessels. Additional fundoscopic images ...
EYE EMERGENCIES
... 2. Ophthalmic artery comes off the carotid and in turn branches into the central retinal artery. From sudden occlusion may get painless monocular loss of vision 3. Causes a permanent loss of vision if retina is ischemic more than 90 min. 4. Etiologies a. Embolic from heart or carotids, thrombotic b. ...
... 2. Ophthalmic artery comes off the carotid and in turn branches into the central retinal artery. From sudden occlusion may get painless monocular loss of vision 3. Causes a permanent loss of vision if retina is ischemic more than 90 min. 4. Etiologies a. Embolic from heart or carotids, thrombotic b. ...
Hydroxychloroquine-Induced Retinal Toxicity
... 1) a thorough ocular examination documenting any preexisting conditions, 2) a Humphrey visual field central 10-2 white-on-white pattern, and 3) at least one of the following objective tests, if available: • fundus autofluorescence (FAF) • multifocal electroretinogram (mfERG) or • spectral domain ...
... 1) a thorough ocular examination documenting any preexisting conditions, 2) a Humphrey visual field central 10-2 white-on-white pattern, and 3) at least one of the following objective tests, if available: • fundus autofluorescence (FAF) • multifocal electroretinogram (mfERG) or • spectral domain ...
NUTRITIONAL THERAPIES in Preventing Macular Degeneration
... potential reflecting decreased endothelial expression of Flk-1, a key receptor for vascular endothelial growth factor;73 DHA likewise can suppress endothelial VEGF signaling.74 Long-chain omega3s are highly susceptible to oxidative damage; one of the key roles of retinal xanthophyll carotenoids, pre ...
... potential reflecting decreased endothelial expression of Flk-1, a key receptor for vascular endothelial growth factor;73 DHA likewise can suppress endothelial VEGF signaling.74 Long-chain omega3s are highly susceptible to oxidative damage; one of the key roles of retinal xanthophyll carotenoids, pre ...
Introduction: Heather Moss, MD, PhD (Attending)
... Acute Altitudinal Visual Field Defect with Optic Disc Edema: Sara Huh, MD (Resident) A 68 year old male presents with the chief complaint of left eye vision loss. His medical history includes shingles affecting V1, V2, and V3 branches of his left face 9 months prior to presentation at UIC. His shing ...
... Acute Altitudinal Visual Field Defect with Optic Disc Edema: Sara Huh, MD (Resident) A 68 year old male presents with the chief complaint of left eye vision loss. His medical history includes shingles affecting V1, V2, and V3 branches of his left face 9 months prior to presentation at UIC. His shing ...
Retinoblastoma? - St. Jude Children`s Research Hospital
... Ultrasonography uses sound waves to create an image of your child’s eye. Sound moves at different speeds through different types of tissue. Some types of tissue reflect sound. In the eye, ultrasound images highlight distinct areas of calcium within a tumor. This is a classic feature of retinoblastom ...
... Ultrasonography uses sound waves to create an image of your child’s eye. Sound moves at different speeds through different types of tissue. Some types of tissue reflect sound. In the eye, ultrasound images highlight distinct areas of calcium within a tumor. This is a classic feature of retinoblastom ...
transconjunctival nonvitrectomizing vitreous surgery versus 25
... Spectralis OCT version 5.1.3.0 (Heidelberg Engineering, Heidelberg, Germany) with Heidelberg Eye Explorer version 1.6.2.0 (Heidelberg Engineering) to assess the central retinal thickness and foveal morphology. All OCT examinations were carried out by a certified operator (F.V.). In OCT images, ERM wa ...
... Spectralis OCT version 5.1.3.0 (Heidelberg Engineering, Heidelberg, Germany) with Heidelberg Eye Explorer version 1.6.2.0 (Heidelberg Engineering) to assess the central retinal thickness and foveal morphology. All OCT examinations were carried out by a certified operator (F.V.). In OCT images, ERM wa ...
Ocular refractive system
... can’t focus on the retina to form clear image Regular astigmatism Simple hyperopic astigmatism Simple myopic astigmatism Compound hyperopic astigmatism Compound myopic astigmatism Mixed astigmatism Irregular astigmatism ...
... can’t focus on the retina to form clear image Regular astigmatism Simple hyperopic astigmatism Simple myopic astigmatism Compound hyperopic astigmatism Compound myopic astigmatism Mixed astigmatism Irregular astigmatism ...
BRVO – Current Practice
... Multiple treatments have been described for BRVO. Among them, anticoagulation therapy, areteriovenous sheathotomy, laser chorio-retinal anastamosis, hemodilution and other systemic therapies were not widely accepted as routine treatment options. ...
... Multiple treatments have been described for BRVO. Among them, anticoagulation therapy, areteriovenous sheathotomy, laser chorio-retinal anastamosis, hemodilution and other systemic therapies were not widely accepted as routine treatment options. ...
Retinal image quality in the rodent eye
... the double-pass images were narrowest when the eye was hyperopic. Fig. 3 shows one-dimensional double-pass line functions for the aerial images shown in Fig. 2. They were obtained from the two-dimensional point spread function by integrating the measurements vertically. As Figs. 2 and 3 demonstrate, ...
... the double-pass images were narrowest when the eye was hyperopic. Fig. 3 shows one-dimensional double-pass line functions for the aerial images shown in Fig. 2. They were obtained from the two-dimensional point spread function by integrating the measurements vertically. As Figs. 2 and 3 demonstrate, ...
Vitreoretinal / Ocular Trauma - Sight Loss and Vision Priority Setting
... What is the relationship between people experiencing troublesome eye floater symptoms and obsessive personality ...
... What is the relationship between people experiencing troublesome eye floater symptoms and obsessive personality ...
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.