What Causes Dim Vision?

A visual attack is actually part of a sensory attack in a simple partial attack. This type of seizure is mainly caused by abnormal discharge of the visual cortex of the occipital lobe, manifested as one (5.5% to 50%), simple light hallucinations (patients complained of flashes, colored balls, gratings, etc. in front of the eyes), and complex visual hallucinations (patients reported People or things that are vivid but not actually present), optical illusions (seeing things become larger, smaller, or deformed). The above-mentioned visual symptoms can appear in one or both visual fields, can be a single symptom of seizures, or can be a "precursor" of a complex partial seizure.

Visual attack

Right!

A visual attack is actually part of a sensory attack in a simple partial attack. This type of seizures is mainly caused by abnormal discharge of the visual cortex of the occipital lobe, which is manifested as one (5.5% to 50%), simple light hallucinations (patients complain that there may be flashes, colored balls, gratings, etc. in front of the eyes), which are complicated

Visual attack: This attack is mainly caused by, but can also be caused by other cortical parts. This is a common sensory symptom, such as seeing fire, flashes, and darkening, but you can also see very complex and complete scenes, or the recurrence of previous experiences, sometimes illusions or comprehensive sensory disorders, which are often seen as Significantly large disease, visually small disease and visual deformity. In addition, patients may have their own hallucinations or autopsies.

Causes of epileptic visual seizures: With the development of society, the expansion of the scope of color application, the derivation and combination of color, more and more attention has been paid to people. For marketing, the visual effect and the visual tension are also important. At first glance people's attention, some people think that some bright lights and flashes will cause epilepsy patients, but the combination of some colors and light will make epilepsy patients more susceptible to disease. These are the causes of visual seizures.

Commonly referred to as visual impairment, mainly refers to the decline in central vision. For example, if someone cannot see the standard visual acuity chart 1.0, it is the central visual impairment. In addition, there are many forms of visual impairment. When suffering from some kind of eye disease, sometimes the central vision is impaired, and sometimes it can be accompanied by several visual impairments. Some special visual impairments are of great value for clinical diagnosis. Some eye diseases often do not require special equipment and examinations by specialists, and can make their own diagnosis through specific visual impairments.

There are several common visual impairments in clinical practice:
Shaming is commonly known as photophobia, which is more common in patients with keratitis, conjunctivitis, iridocyclitis, non-crystalline eyes after lens removal, congenital defect of iris, and eye albinism. Mydriatic optometry in adolescents with myopia can also cause shame symptoms due to dilated pupils.
Diplopia treats one object as two, and it is divided into monocular diplopia and binocular diplopia. Binocular diplopia is usually caused by limited eye movement caused by paralysis of extraocular muscles, and monocular diplopia is mostly caused by lens subluxation or multi- pupillary disease.
Rainbow vision refers to the rainbow-like halo around when you look at the lights at night. It is more common in the early stages of acute angle-closure glaucoma, corneal edema, and cataracts in the initial stage.
Phantom vision refers to a kind of fantasy vision in which a patient sees light, color, or image subjectively, but there is no light source or object in reality. The majority of hallucinations are found in patients with neurological and psychiatric diseases, especially in patients with diseases in the latter half of the brain.
In scotopic vision, all objects present an abnormal color. It can be caused by changes in the refractive color of the eye, such as yellow eyes caused by the brown-yellow tone of core cataract, red eyes caused by a large amount of blood in the vitreous body, and also caused by certain drugs, such as yellow caused by barbiturosis Vision, yellow and white vision caused by digitalis poisoning.
Visual deformation is mostly related to retinopathy, especially when lesions occur in the macular retina. When it appears as an object, the object image is distorted, deformed, elongated, flattened, or enlarged and reduced. It is common in patients with macular cystoid degeneration, central serous choroidal retinopathy, and retinal detachment.
Mosquitoes seem to fly in front of the eyes, usually caused by liquefaction of vitreous body, and are divided into two types: physiological and pathological. Physiological mosquito disease does not affect vision, and generally does not require treatment; pathological mosquito disease, the vision is mostly progressive decline, the dark shadows in front of the eyes need to be treated in time. Such as severe vitreous hemorrhage and vitreous detachment.
Color blindness refers to the color discrimination impairment, which is a congenital eye disease, which is divided into color blindness and color weakness. Color blindness refers to the loss of ability to distinguish between several colors. For example, patients with full color blindness can only distinguish between bright and dark colors, and red and green blindness cannot distinguish between red and green colors. Although patients with color weakness can distinguish colors, they are more difficult and difficult than normal people.
Night blindness is very clear when looking at things in the daytime or in the bright place, but at night or in the dark, it is difficult to see things and move. Night blindness is one of the common symptoms of fundus disease, and it is mostly related to functional or organic lesions of the retina. There are two types of night blindness: congenital and acquired. Congenital night blindness is rare in patients with retinal pigment degeneration, white spot retinitis, and high myopia. Acquired night blindness is more common in patients with vitamin A deficiency, liver disease, hyperthyroidism, malignant tumors, malnutrition, and drug poisoning. Among them, vitamin A deficiency is most common.
Day blindness is the opposite of night blindness. Day blindness is manifested in bright light, and vision is worse than in the evening or dim light. The causes of day blindness are mainly divided into two categories: one is day blindness caused by macular lesions of the eye retina, such as macular degeneration, axial optic neuritis, and optic nerve atrophy; the other is day blindness caused by cloudiness in the front of the eye Such as the central corneal leukoplakia, core cataract, congenital circumnuclear cataract and anterior and posterior polar cataract.
Darkness means that the eyes cannot see the light, and the eyes are completely black. More common in patients with diseases of the retina, optic nerve or brain. It is also occasionally seen during heart attacks, high blood pressure, or hypotension. Among them, the most common clinical one is central retinal artery embolism. (Ding Hongjian)

Visual attack

Commonly known as photophobia, it is more common in patients with keratitis, conjunctivitis, iridocyclitis, aphakia after lens removal, congenital defect of iris, and eye albinism. Mydriatic optometry in adolescents with myopia can also cause shame symptoms due to dilated pupils.

Diplopia

One image is divided into two, which is divided into monocular diplopia and binocular diplopia. Binocular diplopia is usually caused by limited eye movement caused by paralysis of extraocular muscles, and monocular diplopia is mostly caused by lens subluxation or multi- pupillary disease.

Visual illusion

When looking at the lights at night, a rainbow-like halo appears around. It is more common in the early stages of acute angle-closure glaucoma, corneal edema, and cataracts in the initial stage.

Visual episode hallucinations

It refers to an illusion that the patient "sees" light, color, or image subjectively, but there is no light source or object. The majority of hallucinations are found in patients with neurological and psychiatric diseases, especially in patients with diseases in the latter half of the brain.

Visual seizures

When looking at objects, all objects appear in an unusual color. It can be caused by changes in the refractive color of the eye, such as yellow eyes caused by the brown-yellow tone of core cataract, red eyes caused by a large amount of blood in the vitreous body, and also caused by certain drugs, such as yellow caused by barbiturosis. Vision, yellow and white vision caused by digitalis poisoning.
Visual deformation is mostly related to retinopathy, especially when lesions occur in the macular retina. When it appears as an object, the object image is distorted, deformed, elongated, flattened, or enlarged and reduced. It is common in patients with macular cystoid degeneration, central serous choroidal retinopathy, and retinal detachment.

Visual attack fleas

In front of me, there are mosquitoes flying, usually caused by degeneration of vitreous liquefaction, which is divided into two types: physiological and pathological. Physiological mosquito disease does not affect vision, and generally does not require treatment; pathological mosquito disease, the vision is mostly progressive decline, the dark shadows in front of the eyes need to be treated in time. Such as severe vitreous hemorrhage and vitreous detachment.

Visual attack color blindness

Refers to color discrimination, a congenital eye disease, color blindness and color weakness. Color blindness refers to the loss of ability to distinguish between several colors. For example, patients with full color blindness can only distinguish between bright and dark colors, and red and green blindness cannot distinguish between red and green colors. Although patients with color weakness can distinguish colors, they are more difficult and difficult than normal people.

Visual attack night blindness

It is very clear to see things in the day or in the bright place, but at night or in the dark, it is difficult to see things and move. Night blindness is one of the common symptoms of fundus disease, and it is mostly related to functional or organic lesions of the retina. There are two types of night blindness: congenital and acquired. Congenital night blindness is rare in patients with retinal pigment degeneration, white spot retinitis, and high myopia. Acquired night blindness is more common in patients with vitamin A deficiency, liver disease, hyperthyroidism, malignant tumors, malnutrition, and drug poisoning. Among them, vitamin A deficiency is most common.
Day blindness is the opposite of night blindness. Day blindness is manifested in bright light, and vision is worse than in the evening or dim light. The causes of day blindness are mainly divided into two categories: one is day blindness caused by macular lesions of the eye retina, such as macular degeneration, axial optic neuritis, and optic nerve atrophy; the other is day blindness caused by cloudiness in the front of the eye Such as the central corneal leukoplakia, core cataract, congenital circumnuclear cataract and anterior and posterior polar cataract.

Visual attack

It means that the eyes cannot see the light, and the eyes are dark. More common in patients with diseases of the retina, optic nerve or brain. It is also occasionally seen during heart attacks, high blood pressure, or hypotension. Among them, the most common clinical one is central retinal artery embolism. (Ding Hongjian)