To the optical properties of the eye were normal, ocular pressure must be constant. The complexity of determining the increase in pressure in that it does not manifest itself. And so unnoticed may manifest glaucoma. Which in turn about 30 % of cases) can lead to complete blindness. Heaviness in the eyes, fast fatigue, and fatigue may indicate a slight increase in intraocular pressure. In case of appearance of such symptoms is needed as early as possible to see a specialist - an ophthalmologist. He will examine and prescribe treatment.
To identify changes in the body, it is necessary to periodically measure the eye pressure. This procedure is not pleasant, but necessary. Plus of it is that it is absolutely painless. It goes like this: the patient looks down, closing his eyes for centuries. The doctor is in front of the patient, and the index finger of the left hand lightly presses down on the upper eyelid of the right eye and index finger of the right hand on the upper eyelid of the left eye. Thus, the doctor can determine how dense a particular eye. And this, in turn, gives the doctor an idea about eye pressure.
Another way to measure eye pressure, incidentally, is more accurate than palpation. It is held with the help of special devices-weights - heart rate monitors. In this study, the patient lies. The doctor makes a local anaesthetic, then places a dot on the center of the cornea. The result of the measurement is determined by the contact area with the cornea. The more pressure, the less pressed the cornea. On average, the ideal eye pressurem is considered to be 22 mm Hg.St.
If you carefully monitor their health, many troubles can be avoided. And even more difficult to visit an ophthalmologist every six months and measure eye pressure.
Advice 2: How to measure for eyes
To measure the eye using the eye – a person's ability to estimate the distance to objects or their sizes without the aid of instruments. This feature is developed with the help of special exercises or practice, measurements can be produced in several ways.
If you need to measure the distance to a moving object, then use the tactic of closing the eyes. Take, for example, a person who is on the opposite Bank of the river.
To find the distance to a moving pedestrian, extend your arm in the direction of movement of the traveler and focus your eyes the right eye at the end of the index finger until the person closes to them.
At this point, close the right eye and open left. The traveler while supposedly will bounce back.
Now count how many steps will make the pedestrian before you reach your finger.
The distance to the traveler, which is on the opposite Bank, calculate from proprcia: D / P = L / G where D is the desired that you want to calculate in steps P – distance, which has passed the pedestrian (even if it is for example equal to 18 steps), L – the distance from the end of the arm to the eyes, it is on average equal to 60 cm, G – the distance between the pupils, it is on average equal to 6 cm. From the formula it follows that D = N x L / G. the result is: D = 18 x 60 / 6 = 180.
Knowing that one step is equal to about 0.75 m, calculate the distance in meters: 180 x 0.75 = 135 m. This distance is passed the traveller on the opposite Bank of the river.
If you need to determine the distance nedvizhemost objects, then apply the tactics of grass. Take, for example, the river width where you need to determine.
To start, click on the opposite Bank of the river two visible object located as close as possible to the water.
Stand on the very edge of the shore, take in both hands the blade of grass and stretch your arms in front of him, one eyes close.
Fold the blade in half and start to move away from the coast up to that time, while the distance between the two wybranymi objects are not closed by the blade of grass.
Now measure the distance at which you had to move from the beginning shore, and you will get the width of the river.