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DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Nutritional optic neuropathy.

Anna Sawicka-Pierko, Iwona Obuchowska, Zofia Mariak

    Klinika Oczna
    |October 28, 2014
    PubMed
    Summary

    Nutritional optic neuropathy, caused by vitamin deficiencies, impairs vision. Early supplementation can prevent irreversible optic nerve damage.

    Area of Science:

    • Ophthalmology
    • Neurology
    • Nutritional Science

    Background:

    • Nutritional optic neuropathy stems from deficiencies in essential nutrients vital for optic nerve health.
    • Common causes include folic acid and vitamin B complex deficiencies linked to malnutrition, poor diet, vegetarianism, or alcohol abuse.
    • Obesity surgery patients are also at risk.

    Observation:

    • Characterized by painless, progressive, bilateral vision loss and potential color vision deficits.
    • Advanced stages show optic nerve atrophy and disc pallor.
    • A case study highlights a young woman with anemia and optic neuropathy from a restrictive diet.

    Findings:

    • Dietary deficiencies directly impact optic nerve function.
    • Supplementation with folic acid, vitamin B complex, and proteins is key.

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  • Eliminating risk factors is crucial for management.

    • Implications:

    • Prompt diagnosis and treatment are vital to prevent permanent vision loss.
    • Raising awareness of nutritional optic neuropathy is important for public health.
    • Dietary interventions are effective in managing and reversing the condition.