Retinal sentence example
In the eye, injected stem cells attach to a type of retinal cell called astrocytes.
If both vibrate, the point describes a curve which appears continuous through the persistence of the retinal impression.
More usually, by an infolding of the layer of cells in development, we get three layers under the lens; the front layer is the corneagen layer, and is separated by a membrane from the other two which, more or less, fuse and contain the nerve-end-cells (retinal layer).
The incidence of retinal angioma does not appear to be correlated with specific germline mutations.
Conclusion The ASR retinal prosthesis, to date, has shown no biosafety or negative personal reactions in people with RP.Advertisement
Are we dealing with just a handful of disease mechanisms or are there many different routes to retinal degeneration?
The small area of lattice degeneration in the superior temporal quadrant OS remained free of retinal breaks.
The only threat to vision is the small chance of a retinal tear leading to a retinal detachment.
Patients were selected from all patients undergoing primary vitrectomy for rhegmatogenous retinal detachment.
The group have studied a number of conditions associated with progressive retinal dystrophy.Advertisement
Extensive or ' geographic ' atrophy of the retinal pigment epithelium, however, can result in marked visual acuity loss.
The practitioner should always bear in mind that failure to examine the fundus properly under mydriasis may lead to serious retinal changes being missed.
The ocular findings in albinism include nystagmus, decreased visual acuity; hypopigmentation of retinal tissue, and macular hypoplasia.
Reading speed improves if a new trained retinal locus (TRL) is established in an area that is more favorable for reading.
Important eye problems related to degraded visual acuity and depth perception include myopia, hyperopia, astigmatism, presbyopia, and retinal rivalry.Advertisement
Is there anything that can be done to prevent a retinal vessel occlusion?
Examination The visual acuity is reduced in central retinal vein occlusion.
The retinol is oxidized to its aldehyde, retinal, which complexes with a molecule in the eye called opsin.
In the visual pathway the fibers of the retinal ganglion cells form the optic nerve.
The laser isn't used on the blood vessels directly, but is scattered over the whole retina (pan retinal photocoagulation ).Advertisement
Our perception of color arises from the presence of three types of retinal photoreceptors (cones) sensitive to different wavelengths of light.
Early ARM is when only drusen and retinal pigment epithelial changes are present.
Methods An ASR retinal prosthesis was implanted 20 degrees from the fovea in 10 people with RP.
It is thought that oxygen radicals cause abnormalities in the developing retinal blood supply.
The role of the retinal pigment epithelium in regulating development of the neural retina.Advertisement
Researchers transplanted retinal cells into adult mice lacking the genes for two proteins important in glial scar formation.
She told us about the new retinal screening which is about to start at the West Mendip Hospital in Glastonbury.
However, the size of the retinal image depends upon the optical angle subtended at the eye by the tree.
Retinal vein occlusion The retinal vein occlusion The retinal veins drain away the used blood from the retinal cells.
A person who seems to have a retinal detachment must be seen by an eye surgeon right away.Advertisement
Stickler syndrome is the commonest inherited cause of retinal detachment in children.
When this happens the retinal cells quickly suffer from the lack of fresh oxygen.
Cortisol, thyroid and GH deficient, epilepsy, retinal aplasia, tetralogy of fallots (repaired).
Retinal vein occlusion The retinal veins drain away the used blood from the retinal cells.
Aspirin therapy is not associated with an increased risk for retinal or vitreous hemorrhage.Advertisement
In addition, a veterinarian certified as a dog ophthalmologist must test the puppies' eyes since also prone to a myriad of conditions including progressive retinal atrophy.
It also may suffer from eye conditions, such a Progressive Retinal Atrophy.
This breed is also known to suffer from eyelid problems, progressive retinal atrophy (PRA), boils on the lip and tumors.
Some Labs are susceptible to eye problems, such as cataracts, progressive retinal atrophy and retinal dysplasia.
Retinal macular degeneration (dry type) on the other hand is irreversible, resulting in loss of central vision while the eye retains peripheral vision.Advertisement
This can ring especially true if you suffer from, or have suffered from, macular degeneration or any retinal dystrophies.
Untreated retinal detachment can cause blindness.
The danger of retinal detachment is an important reason for children to avoid contact sports or other activities that could cause a blow on the head or being knocked to the ground.
All children with Marfan should be taught to recognize the signs of retinal detachment (sudden blurring of vision in one eye becoming progressively worse without pain or redness) and ask their parents to seek professional help immediately.
Rough physical contact may cause retinal detachment.Advertisement
Its presence is one of the defining parameters (along with retinal hemorrhage) of shaken baby syndrome.
Retinal damage becomes severe when blood pressure levels are high and remain elevated for a prolonged period of time.
In order for retinoblastoma to be classified as trilateral retinoblastoma, the tumor must have developed independently and not as the result of the spread of the retinal cancer.
The retinal tumor which characterizes retinoblastoma is malignant, meaning that it can metastasize (spread) to other parts of the eye and eventually other parts of the body.
A malignant tumor of the retina (retinoblastoma) can result when just one retinal cell loses control of it cell cycle and replicates out of control.Advertisement
Normally, the tumor suppressor protein produced by RB1 prevents a retinal cell from becoming cancerous.
Only one functioning RB1 gene in a retinal cell is necessary to prevent the cell from becoming cancerous.
If both RB1 genes in a retinal cell become non-functional, then a retinal cell can become cancerous and retinoblastoma can result.
A person with an inherited missing or non-functional RB1 gene will develop a retinal tumor if the remaining RB1 gene becomes changed or deleted in a retinal cell.
It is also possible that the parent had developed a retinal tumor that was destroyed by the body.
Retinoblastoma can also result when both RB1 genes become spontaneously changed or deleted in a retinal cell but the RB1 genes are normal in all the other cells of the body.
If the tumor has not spread extensively, the radiation beam can be focused on the cancerous retinal cells.
For example, a patient with bilateral retinoblastoma has this retinal tumor in both eyes.
Cryotherapy is used in the treatment skin lesions, Parkinson's disease, some cancers, retinal detachment, and cataracts.
Children who have been diagnosed with retinoblastoma should receive periodic dilated retinal examinations until the age of five.
When a child is diagnosed with retinoblastoma, it is recommended that parents and siblings receive a dilated retinal examination by an ophthalmologist who is experienced in the diagnosis and treatment of the disease.
It is also recommended that siblings continue to undergo periodic retinal examinations under anesthetic until they are three years of age.
The retinal examinations can be avoided if DNA testing indicates that the patient has a non-inherited form of retinoblastoma or if the sibling has not inherited the RB1 gene change/deletion.
The children of someone diagnosed with retinoblastoma should also undergo periodic retinal examinations under anesthetic.
Retinal surveillance should be performed unless DNA testing proves that their child does not possess the RB1 gene change/deletion.
Incomplete development of any structures in the eye (coloboma) or failure of the retina to develop properly (retinal dysplasia) produces vision problems.
Retinal hemorrhage-Bleeding of the retina, a key structure in vision located at the back of the eye.
Patients with high myopia, greater than 6.00 diopters, have an increased risk of developing a retinal tear, hole, or detachment; a posterior staphyloma; a posterior vitreous detachment; or glaucoma.
Retinal detachments and tears are possible, however, in highly myopic children or adolescents who play contact sports.
If a retinal problem is diagnosed or suspected, referral to a retinal specialist is necessary.
There may be a connection between hormonal birth control and retinal thrombosis (blood clots within the eye).
The body can also change retinol into retinoic acid or retinal which are both usable, or active, forms of this important vitamin.
Its most important role is in the eye, where it creates a molecule called retinal that is necessary for low light and color vision.
These dorsal eyes are very perfect in elaboration, possessing lens, retinal nerve-end cells, retinal pigment and optic nerve.
Hickson and others, that in the bivalves Pecten and Spondylus, which also have eyes upon the mantle quite distinct from typical cephalic eyes, there is the same relationship as in Oncidiidae of the optic nerve to the retinal cells.
The drug must be at once withheld if haemorrhages (subcutaneous, retinal, &c.) are observed.
The upper layer is the corneagen and secretes the lens, the lower is the retinal layer.
It is found that in embryological growth the retinal layer of the central eyes forms as a separate pouch, which is pushed in laterally beneath the corneagen layer from the epidermic cell layer.
Numerous rhabdomeres (grouped as rhabdoms in Limulus) are found in the retinal layer of the central eyes also.
Median eyes are present, which are monomeniscous, with distinct retinal and corneagenous cell-layers, and placed centrally on the prosoma.
It must, however, be distinctly borne in mind that there is a fundamental difference between the eye of Vertebrates and of all other groups in the fact that in the Vertebrata the retinal body is itself a part of the central nervous system, and not a separate C E k e FIG.
It is typically tripartite, consisting of three cup-shaped masses of pigment, the cavity of each cup being filled with columnar retinal cells.
There was a quadruple lock system on it, requiring not only two thumbprints, but a code, a retinal scan, and another sensor pad he didn't recognize.