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Amblyopia, also called lazy eye, is a disorder of sight in which the brain fails to fully process input from one eye and over time favors the other eye. [1] It results in decreased vision in an eye that typically appears normal in other aspects. [ 1 ]
Ocular dominance columns were important in early studies of cortical plasticity, as it was found that monocular deprivation causes the columns to degrade, with the non-deprived eye assuming control of more of the cortical cells. [3] It is believed that ocular dominance columns must be important in binocular vision.
Accommodative dysfunction, binocular dysfunction, amblyopia, strabismus [3] Causes: Axial length of eyeball is too short, lens or cornea is flatter than normal, aphakia [2] Risk factors: Ageing, hereditary [2] Diagnostic method: Eye exam: Differential diagnosis: Amblyopia, retrobulbar optic neuropathy, retinitis pigmentosa sine pigmento [4 ...
Diagram of a human eye (horizontal section of the right eye) 1. Lens, 2. Zonule of Zinn or Ciliary zonule, 3. Posterior chamber and 4. Anterior chamber with 5. Aqueous humour flow; 6. Pupil, 7. Corneosclera or Fibrous tunic with 8. Cornea, 9. Trabecular meshwork and Schlemm's canal. 10. Corneal limbus and 11. Sclera; 12. Conjunctiva, 13. Uvea ...
Lesions in that pathway cause a variety of visual field defects. In the visual system of human eye , the visual information processed by retinal photoreceptor cells travel in the following way: Retina → Optic nerve → Optic chiasma (here the nasal visual field of both eyes cross over to the opposite side)→ Optic tract → Lateral ...
Spotlight – In those patients with amblyopia a spotlight could be used. (Same as near targets). [1] Snellen chart – This is the most commonly used target when assessing a patient's far component of a cover test. [1] Small landmark – Any fixed landmark at eye level, which can be seen through a window. [1]
Ptosis caused by oculomotor palsy can be unilateral or bilateral, as the subnucleus to the levator muscle is a shared midline structure in the brainstem. In cases where the palsy is caused by the compression of the nerve by a tumor or aneurysm, it is highly likely to result in an abnormal ipsilateral papillary response and a larger pupil ...
The causes of exotropia are not fully understood. Six muscles control eye movement, four that move the eye up and down and two that move it left and right. All these muscles must be coordinated and working properly for the brain to see a single image. When one or more of these muscles does not work properly, some form of strabismus may occur.