Vision changes and problems can be caused by many different conditions. Presbyopia -- difficulty focusing on objects that are close. This problem often becomes noticeable in your early to mid 40s. Cataracts -- cloudiness over the eye lens, causing poor nighttime vision, halos around lights, and sensitivity to glare. Cataracts are common in the elderly. Glaucoma -- increased pressure in the eye, which is most often painless. Vision will be normal at first, but over time you can develop poor night vision, blind spots, and loss of vision to either side. Glaucoma can also happen suddenly, which is a medical emergency. Diabetic eye disease.
The normal blood glucose level (tested while fasting) for non-diabetics, should be between 3.9 and 5.5 mmol/L (70 to 100 mg/dL). The mean normal blood glucose level in humans is about 5.5 mmol/L (100 mg/dL); however, this level fluctuates throughout the day.he normal blood glucose level (tested while fasting) for non-diabetics, should be between 3.9 and 5.5 mmol/L (70 to 100 mg/dL). The mean normal blood glucose level in humans is about 5.5 mmol/L (100 mg/dL); however, this level fluctuates throughout the day.
Blood sugar levels indicate the amount of sugar or glucose absorbed into the bloodstream. Blood sugar levels that are either too high or too low can cause death. Diabetics and those with certain conditions such as hypoglycemia must maintain their blood sugar levels and monitor them closely. The normal blood sugar range is 70 to 100. A diabetic can have a level of 60 to 120 and still feel fine. A fatally high blood sugar level is anything above 550. It's possible for an adult to reach even higher levels before exhibiting any symptoms or problems. When the level reaches 600, the person develops hyperosmolar syndrome, which can cause diabetic coma and death.