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One of the most common problems associated with eyesight is high intraocular tonus. This happens as a result of liquids pressure in the intraocular space, as well as vitreous body pressure on the eye walls. Normal eye tonus indices normalize when intraocular liquids form and outflow in a proper way.
To check an eye tonus, an ophthalmologist can resort to one of the following techniques:
Eye pressure measurements are of great importance, facilitating glaucoma detection in the early stages of its development. Failing to make necessary measurements and provide treatment in a timely manner may lead to blindness. The exact eye pressure measurements should be conducted at different times during the day using special ophthalmic devices.
In medical facilities and offices, various devices are utilized, depending on pressure measurement method. While resorting to the contact test method, doctors utilize the Maklakov tonometer. In the process of measurements, an ophthalmologist applies a special colored weight which is placed onto the eye. The eye then is slightly deformed under that weight. After that, the weight is placed onto a paper sheet to get a color print. Color intensity shows the eye pressure.
To use the Maklakov tonometer, local anesthesia and special disinfectant eye drops are required. While using this technique, an intraocular pressure is measured twice in each eye.
When non-contact methods are used, it is worth mentioning dedicated optical devices which ensure safe and painless examination procedures:
A pneumotonometer is a computer machine (operating in automatic mode) with a special headrest for a patient. The instrument reads the pressure values when a patient looks straight ahead (without blinking). Eye pressure detection occurs using an air jet, which is directed to the patient’s eyes at a given speed. An intraocular tonus is determined by the corneal reaction speed when it is effected by air masses.
An electrotonograph is an electromechanical ophthalmology machine which graphically registers changes in the eye tonus. During this examination, a patient can sit or lie. The device detects the volume of liquids in the eye and determines their outflow rate during one minute.
The most important specification of gastroscope is:
The prices of some instruments can be as low as 650 USD or less, while the newest, high-tier systems may cost as much as 15000 USD. The manufacturer plays a crucial role in making up the price. The more famous the brand the more expensive the machine, as the brand name itself says a lot about the quality and longevity.Nidek,Zeiss ,Topcon, Canon are considered to be the most well-known. Besides, one should understand that new and demo machines will cost more than refurbished or used ones. What is the difference? New machines have never been used. They have the manufacturer’s warranty. Demo machines are, as a rule, exhibition models. They have not been used in clinical practice but they have been often presented at exhibitions. As a result, the price is lower. Refurbished machines are used machines that have undergone improvements (refurbishment can be done at the manufacturer’s facilities or in private repair shops)
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