Many people who are reading this might have heard about measuring eyesight with a computer system or have already used the service but when we are observing will said that happy and unhappy with wear glass on your eye. Although it is a high-precision computer system that sounds good but why can these events occur?
Objective examination is an examination that the patient does not need to be involved (sitting just, not having to be busy, the inspector will find it. Prescription) has 2 types which are
1.1 Retinoscopy is the use of a tool called the retinoscope Shining light into the eyeball (while the patient is looking at a distance of 6 meters for the focusing system or the Accommodation system In the most relaxed state (Relax) the light from the retinoscope Will run through the tears of the cornea to the retina and then reflect back through the jelly in the eye The inspector will assess the characteristics of the reflected light as there are short-sighted, long-tilting eyes, each eye problem will cause the light pattern differently, then use the lens on the lens or Phoroptor to Neutral. To be a normal sight.
Pros: Patient dormant Don’t say anything We can know how much eyes How to see And can be examined in infants, small children who are still unable to read books Or even people who are unconscious can also check.
Con: There are very few people who can use the Expertise in a Retinaloscope. Because it requires a lot of skills And have to practice a lot To learn each type of reflections and to completely neutralize your vision requires a lot of experience.
1.2 Auto Refractor Because using Retinoscopy is difficult. And have to practice a lot Therefore computer tools were developed to help measure So the inspectors don’t need to use a lot of skills The patient just sat on the back of the chin, placed his forehead and looked at the image on the computer. Which is a trick to have a depth Such as nearby vegetables Have a house far away And the mountains are far away The computer uses the light to splash into the eyeball and look at the reflected light and switch the lens for Auto Neutral Eyes.
Advantages: Fast, easy to do. People don’t have to be very skilled.
Disadvantages: cannot detect babies. And disadvantages that are a lot of problems even in adults And the disadvantage I will bring to today’s issue is “computer Unable to control the system Accommodation and when patients look at each picture The focus system will keep change.
Subjective examination is a test that the patient must respond or participate. (Patients have to say.) There are two types of examinations:
Phosphorous: The use of a tool called Phosphorous (which looks like a skull). This tool is a set of lenses. Which the inspector will check by changing the lens according to the examination method Correlate with the text to look at 6 meters in order to find the best eye, provided that the eyes must be the most relaxed.
Advantages: Able to control the eyes of patients with all functions And to prevent the focusing system or focusing system to be stable.
Disadvantages: Users need to use a lot of skills. Must understand both the tools in relation to the Projector Cart in order to get the most out of the eye.
2. Trial Lens:
This is the use of a lens, which is placed in the lens case. Then pick and try to put each piece one by one Then asked the patient which one is better Which can also be used as well. The
Advantage: it is not convenient because you have to pick up the lenses and plug them one by one But if the inspector is very knowledgeable and skilled It can work out as well as the first.
Disadvantages: Controlling focus or Accommodation system is difficult. Over Minus easily if not careful.
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