Answer:
Common causes of blindness are diabetic neuropathy, glaucoma and cataracts.
Explanation:
Blindness refers to the complete lack of functional vision.It occurs when an inadequate amount of light hits the retina, or the information has not been delivered to the brain correctly.
Complete blindness : characterized by a complete and total loss of vision. Merck Manuals reports that legal blindness is defined as having equal to or worse than a 20/200 visual acuity in the better eye. Having a visual acuity of 20/200 means that someone with normal vision can see an object at 200 feet, and a person with impaired vision can see at a distance no further than 20 feet. Several different diseases can cause complete blindness; some develop later in life and some are present at birth. The leading cause of blindness in the United States is diabetes, according to the National Eye Institute. Diabetes causes diabetic retinopathy, which results in destruction of the retina. Other causes of complete blindness include age-related macular degeneration, which the National Eye Institute calls the most common cause of blindness in adults who are 60 or older; cataracts, which obstructs light from hitting the retina because of opaque patches on a lens; and glaucoma, which causes blindness due to damage to the optic nerve.
Color Blindness
:
People who have color blindness, also called dyschromatopsia, are unable to distinguish certain colors. This type of blindness more commonly affects men than women. Merck Manuals reports that the most common form of color blindness is red-green color blindness, which makes it difficult to distinguish certain shades of red and green. Color blindness is almost always present at birth, and is usually caused by the presence of a defective gene on the X chromosome. The reason that more men are affected by color blindness than women is that women have two X chromosomes; thus, even if they are "carriers" of a bad gene, their other X chromosome usually has a functional gene. Because men have only one X chromosome, the presence of one bad gene is sufficient to cause color blindness. Defective retinal cells result in some forms of color blindness; other forms are caused by defects in the optic nerve.
Night Blindness
:
Night blindness is vision impairment that occurs at night or when light is dim. It does not generally result in a complete lack of vision but significantly impaired vision. People with night blindness often have difficulty driving at night or seeing stars. Several different factors cause night blindness, according to the University of Maryland Medical Center. These factors include cataracts, birth defects, a vitamin A deficiency, or a retinal disease called retinitis pigmentosa
Answer:
sorry i have no idea i will come back to u once i figure it out :)
Explanation:
Answer:
swelling, bruising, tenderness, dizy, migraine etc...
Explanation:
Answer:
- First, place some gauze pads or a clean cloth on the wound and hold for 10 minutes.
- If the gauze or cloth becomes soaked with blood, without removing it, place another on top and continue pressing for another 10 minutes.
- If the blood does not stop flowing, place the wound raised upwards to avoid excessive bleeding.
While you call an Emergency Ambulance.
Explanation:
Bleeding usually occurs from a cut or trauma that causes the blood vessels to break.
An arterial hemorrhage occurs when the outflow of blood comes from the circulatory system to the outside caused by the rupture of an artery.
Until the artery closes or the wound is cauterized, blood is likely to continue to flow until the person shows symptoms of confusion, slow heart rate, and shock that ultimately leaves the person to bleed to death.
Superior vena cava
Inferior vena cava
Right atrium
Tricuspid valve
Right ventricle
Pulmonary valve
Pulmonary arteries
Lungs
Pulmonary veins
Left atrium
Bicuspid valve
Left ventricle
Aortic valve
Aorta
The rest of the body
