1 resultado para Domain-specific visual language
em Hospital Prof. Dr. Fernando Fonseca - Portugal
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Resumo:
Purpose: Albinism is a rare genetic disorder of melanin production, which can affect only eyes or simultaneously eyes and skin/hair, resulting respectively in ocular (OA) or oculocutaneous albinism (OCA). Through of a case report of a child with OCA we pretend review ophthalmological manifestations of albinism. Case Report: A girl of West African descent was referenced to our appointment for ophthalmological evaluation of oculocutaneous albinism. Visual acuity was 20/310 OD e 20/630 OS by teller cards. In biomicroscopy, iris hypopigmentation and transillumination was visible, allowing to see spiral vessels and other iris details. Fundoscopy showed a denser and complex choroidal circulation due to lack of pigment in retinal pigment epithelium. Foveal hypoplasia was assumed because foveal pit is not apparent and vessels become less respectful of normal arcade and transverse the macula. Results: Melanin plays an important role in the development of the optic system and it’s absence leads to diverse ocular manifestations, such as: iris hypopigmentation and transillumination , reducted pigmentation of retinal pigment epithelium cells, photoreceptor rod cell deficits, foveal hypoplasia, optic nerve hypoplasia and misrouting of optic nerve at the chiasm, with temporal retina fibers inappropriately routed contralaterally instead of ipsilaterally. Photophobia, nystagmus, reduced visual acuity, color impairment and strabismus are other manifestations usually seen in albinism. Conclusion: Ophthalmologists must be familiar with the specific visual manifestations and needs of these patients. It is essential to correct refractive error to optimize visual acuity. Patients should also be advised to wear tinted glasses and sunblock. In more severely affected children they may benefit of low vision consultation and specialized low vision aids like telescopes.