Handheld vision screening instrument is inaccurate. Nowadays, many primary school students have been exposed to TV and mobile phones for a long time, and even some primary schools have been exposed to electronic screens for a long time, which leads to the phenomenon of decreased vision. There are many ways to check pupils' eyesight, among which hand-held vision screening instrument is a common one and a very convenient one. So is the hand-held vision screening instrument accurate? Let's get to know each other.
Is 1 allowed with hand-held vision screening instrument?
Is the hand-held vision screening instrument accurate?
1, the hand-held vision screening instrument has high accuracy. Automatic, non-invasive-the distance of 35 cm can be checked by pressing a button.
2, fast and effective-complete binocular automatic test in 5 seconds.
3. No need for patient response-only minimal cooperation, especially suitable for infants, children and patients with language disorders.
4, suitable for children-SureSight can attract the attention of infants and young children through flashing lights and sounds.
5. Objectivity-Automatically test and display accurate readings.
6. Complete and accurate refractive information-automatically detect refractive problems, including myopia, hyperopia, astigmatism and anisometropia.
7. Breakthrough technology -WelchAllyn's unique technology ensures the speed and accuracy of detection.
What are the characteristics of hand-held vision screening instrument?
1, simple and easy to carry-the handheld instrument can test continuously for 3 hours, and the printer using dry battery can print the results anytime and anywhere.
2, comfortable and exquisite design-0.9kg weight, self-adjustable hand strap is suitable for anyone to use.
3. Sealed protective box-protects the internal optical components, electronic equipment and moisture of the instrument.
4. Wide screening range-suitable for screening infants, children and adults. Suitable for screening people who wear glasses or contact lenses.
For primary school students, we must pay attention to protecting their eyesight and do more eye exercises at ordinary times to avoid the phenomenon of decreased eyesight. The above is about "Is the hand-held vision screening instrument accurate?" Parents and friends should also supervise their children to prevent their poor eyesight from affecting their studies.
Is the hand-held vision screening instrument accurate 2
1, visual inspection method steps
(1) Before the exam, explain to the candidates how to observe the eye chart correctly.
(2) Check the eyes separately, first check the right eye, and then check the left eye. When examining one eye, the other eye must be completely covered with an eye patch. But be careful not to oppress the eyeball.
(3) When checking, let the candidates see the largest line of marks first. If you can identify it, point out the smaller marks to the candidates step by step from top to bottom, from big to small, until you find the smallest line of marks that can be clearly identified. If it is estimated that the patient's vision is still good, it is not necessary to start with the largest line mark, but may start with the smaller line mark as appropriate.
2, check the eyesight precautions
When testing people over 7 years old, time should be controlled. Remember to pay attention to the time when teenagers test their eyesight. Don't forget the time when testing their eyesight. They should pay attention to the reasonable collocation of time, at most 1 to 2 minutes, not too long, and control the time. When testing vision, see if the ambiguity of the vision tester can be seen clearly. People standing next to the eye chart should correctly indicate the eye chart, whether it is up or down, point out the English letters back and forth, ask whether it is vague or clear, and judge whether the indication is up or down according to the situation.