How to tell farsightedness and nearsightedness with an eye chart How to test farsightedness with an

In a professional hospital, there will be the right method.

Want to know if you're nearsighted or farsighted? Now you can see it through this little game, come and see if you are short-sighted or far-sighted!

Hello, myopia is blurry when looking at the distance, and seeing the near is clear, while hyperopia is just the opposite. However, it is recommended that you still have to test the optometry to find out.

The distance between the eye chart and the person being examined must be fixed correctly, and the patient must be 5 meters away from the table. If the indoor distance is less than 5 meters long, a flat mirror should be placed in the meter to reflect the eye chart.

Test method: Cover one eye first, identify the direction of the "E" notch from top to bottom with one eye, until it can no longer be recognized, and record it. Normal visual acuity should be above.

If the subject cannot see either, he or she should move forward until he or she can see, and his visual acuity is "distance 5=visual acuity"; If you can't see it within half a meter, you can make the test subject identify the index, measure the hand, light perception, etc.

Visual acuity is recorded according to the examination. Near vision mostly uses the "J" near eye chart, the same method to identify the direction of the "E" word notch, until it can not be recognized, the near range can be adjusted by itself, normal near vision can see a line clearly at 30 cm, near vision examination is helpful for the diagnosis of refractive error.

The standard distance for measuring vision is generally 5 meters, even if the vision is normal, then you need to pay attention to it:

1. Pay attention to the time you spend with your eyes.

Children's eye development is not perfect, the ability to work is low, every time you read or write for an hour, you should let the child go to outdoor activities, do games, look into the distance, or observe the flowers and trees, so that the tense eye muscles are relaxed, eliminate fatigue. In addition, it is necessary to make the child's life regular, have enough sleep, and let the eyes get enough rest.

2. Pay attention to the light of your eyes.

Do not allow your child to read or write in dark light or sunlight. If a 25-watt light bulb is used indoors at night, the distance between the books and the lamp should be within 1 meter. If you use a 60-watt bulb, the distance between the book and the bulb should be 1 2 meters.

Cloudy days, dusk, weak light lines in the moonlight, and strong light in the sun, are not suitable for reading and writing. When watching TV, it is necessary to maintain a suitable distance, which should generally be 5 7 times the diagonal length of the phosphor screen. The time to watch TV should not exceed 2 hours at a time.

3. Pay attention to eye exercise.

Physical exercise can enhance blood circulation and metabolism, supply more nutrients to the eyes, and enhance the resistance of the eyes. The direct exercise is eye exercises, which is based on the massage, massage, acupuncture and acupuncture acupuncture points of Chinese medicine, combined with the unprecedented medical sports of Zaokuanhui, which is a scientific method to protect eyesight. Parents should learn the basic knowledge of eye exercises, give specific guidance and often urge their children to do eye exercises, and persevere.

4. Pay attention to eye nutrition.

In order to protect children's eyes, children can eat more carrots, animal liver, lean meat, to supplement vitamin A, or regularly supplement the comprehensive nutrition of the eyes with Leyan vision nutrients, and at the same time, it is also necessary to appropriately consume millet, tofu, animal liver and other supplements of vitamin B2, so as to avoid night blindness, corneal malacia, eye redness, dry itching and other symptoms. Eating too much sugar will harm your child's eyesight, so your child's sugar intake should be controlled.

5. Pay attention to regular inspections.

Regular check-ups are due to the fact that children's eye structure, binocular visual function, and intelligence are still in the process of continuous development after birth, and the content of the examination is different at different ages. The usual age of ophthalmologic examination is generally 2-7 days after birth, 42 days after birth, 3 months, 6 months, and 1 year of age, and then once a year. In this way, the problem can be detected early and corrected early, instead of waiting until the vision has deteriorated and there is a vision problem before going for a check-up.

Ancillary eye chart method: When checking distance visual acuity, the examination distance is 5 meters, the height of the eye chart should be parallel to the eye of the examinee with or logarithmic eye chart, and the illumination should be appropriate. Visual acuity is generally checked first on the right side and then on the left side, with each eye being done separately.

When examining one eye, the other eye can be covered with an eye-covering spoon. The person being examined must have their eyes wide open and must not squint, squint or tilt their head.

The eye chart is designed according to the principle of viewing angle. The so-called angle of view is the angle formed by the light emitted by two points in the outside world through the nodes in the eye (that is, the angle of alliance caused by the intersection of two points of the external object into the eye). Under normal circumstances, the human eye can distinguish the minimum distance between two points to form a viewing angle as the smallest viewing angle, that is, a one-point viewing angle.

The examination visual acuity is generally divided into two categories: distance vision and near visual acuity, and the standard logarithmic visual acuity chart is mainly used in China (the second generation has been implemented in May 2012), which is composed of 12 rows of "E" characters with different sizes and opening directions; Measure from or from; Each line is marked, and the patient's line of sight should be parallel to the row, 5 meters away from the eye chart, and the distance between the eye chart and the person being examined must be correctly fixed, and the patient should be 5 meters away from the chart.

Your test results show that:

The right eye is myopic 475 degrees, astigmatism is 50 degrees, and the astigmatism axis is 177; The left eye is myopic 425 degrees, astigmatism is 25 degrees, and the astigmatism axis is 144. Interpupillary distance: 63mm.

This is the result of computer optometry, which is just a reference power, if you are willing to wear glasses, it is recommended to go to a regular hospital for comprehensive optometry to determine the detailed power.

Introduce. The standard eye chart is made up of 12 rows of E in different directions, and the visual acuity should be tested at a certain distance from the eye chart, and the specific values should be checked according to the recommended values on the eye chart. Generally in the range of 3-5 meters.

When checking the eyesight, the spine should be buried, and a light source should be installed at the eye chart to avoid the deviation of the light cause of the vision test.

A standard eye chart is made up of 12 rows of E in different directions.

The visual acuity test should be done at a distance from the eye chart, and the specific values should be checked according to the recommended values on the eye chart. Generally in the range of 3-5 meters.

When checking eyesight, a light source should be installed at the eye chart to avoid deviations caused by light to the vision test.

When testing visual acuity, the e-line should be tested step by step, and the direction of the e-opening should be compared with gestures.

At a distance of 5 meters, the standard E direction can be accurately judged as normal vision. Visual acuity should be measured in each eye individually.

The two eyes are tested separately and can be viewed from top to bottom or from bottom to top.

And the bottom line that you can see at the bottom is probably your current eyesight.

Of course, there will inevitably be errors in measuring your own eyesight, so it is recommended that if you want to accurately measure your eyesight, it is better to have accurate optometry in the hospital.

Nowadays, vision problems are getting younger and younger, and parents should pay attention to it once they find that there is vision loss.

Developing a proper eye habit is the first step.

It is recommended that children pay attention to eye hygiene and do not see for a long time in bright or dim light; Prevent the occurrence of terminal nystrain (e.g., dry eyes, dizziness, etc.).

When reading, the distance between the eyes and the book should be 30 cm, the posture should be upright, not lying down to read or walking while reading, and the light should be sufficient. Reading, writing, watching TV, and playing on the computer for 40 minutes in a row, you should close your eyes and rest and look into the distance for 5 minutes. 3 months or half a year to the hospital for reexamination; Pay attention to dietary habits and nutritional combinations to avoid chromium and calcium trace element deficiencies.

Prompt medication is the second step.

Generally, doctors recommend taking Joyeye Vision Nutrients, taking it with warm water, and insisting on taking it for a period of time, which can quickly improve your eyesight, and the younger you are, the easier it is for your vision to recover.

How to measure visual acuity with an eye chart:

5 meters from the standard eye chart.

e"Letters gesture your hand to the right.

Just hit your hand down, the same below

m"Letters of your hand down big gesture.

Always gesture in the direction of the opening of the letters.

There are many letters of different sizes, and standing at a certain distance, you can see the most letters and say how to gesture, and your eyesight is the corresponding place on the eye chart.

The daily eye examination can be checked with an eye chart, but if the eye is myopia, weak, astigmatism, etc., it is best to go to the hospital regularly for accurate refraction.

In addition, it should be noted that children under the age of 18 are still in the period of vision development and have vision problems, so they need to take two packs of eye vision nutrients a day in time, and insist on taking them for a period of time, and the vision problems will gradually improve and their vision will be improved.

The number of visual power and visual acuity are disproportionate, this is not to say how many degrees is a few tenths of a point, there is no precedent relationship, so only through refraction can determine the diopter, and only through the naked eye vision examination can determine what your visual acuity is.

About 3 meters from the eye chart, e"Letters gesture your hand to the right.

Just hit your hand down, the same below

m"Letters of your hand down big gesture.

There are many letters of different sizes, standing at a certain distance, you can see which letter at most and say how to gestur, your eyesight is the corresponding place of the eye chart.

5 meters away from each eye to see or represent the international standard logarithmic eye chart). On the eye chart is the same line, just different notations, and the test distance is meters.