Eyeglasses & Eye Care Community

How to understand the glasses prescription

The forms of the glasses prescription are in a great variety, but the basic items are the same such as name, sex, age, occupation and so on.

The most important items are the nature of the sphere lens, the diopter, the refraction degree of the column lens, the axial position, uncorrected visual acuity of the right and left eyes, corrected visual acuity as well as the pupil distance.

Now I would like to tell you the meaning of the marks in the prescription.

OD / RE / R :  right eye
OS / LE / L : left eye
+ :  Convex lens   ( for the hypermetropia )
- :  Concave lens   （for the myopia）

After “ +” or“ –”  , the Arabic value is lens’ diopter, but what needs to pay attention to is that diopter in the prescription glasses  and the strength are not the same, a difference of 100 times between them, for instance, – 1.00D is equal to 100 degrees which we usually say;

DS :  Spherical lens （both for hyperopia and myopia ）
DC :  Cylindrical lens ( for astigmatism )

Behind DS, there is a mark “()”, representing the spherical lens “United” the following the cylindrical lens; at the back of DC, there is also a mark “×”, separating  the front degree of astigmatism from the behind the astigmatic lens axis （1～180°）;

PD :  pupil distance
For example,
Ｒ：—2.OO DS () — 2.OO DC × 90°
ＰＤ：63mm

It stands for right eye，200 degrees of myopia with 200 degrees of astigmatism, degree of astigmatism axis is 90 °, the pupil distance is 63 millimeters .

Popularity: 12% [?]

Seven Habits That are Damaging Your Eyes

At the present, there are 30,000,000 blinds and 120,000,000 low vision patients all over the world. If you do not want to be one of them, you have to pay attention to the following bad habits in daily life.

1.Excessive Drinking

Alcohol is the enemy number one to eyes. Do you know why the face flushes after drinking? That is because alcohol promotes blood circulation and dilatation of the capillaries. The skin around eyes is tender and the capillaries are extremely small which are easily breakable after excessive drinking. So it is better to keep away from drinking.

2.Smoking

Amblyopia is one of the most common harms caused by smoking. There are two reasons. Firstly, the oxygen consumption in human body caused by smoking results in that the oxygen content in blood decreases. While, the retina is very sensitive to oxygen deprivation, if things go on like this, the optic nerve will mutate. Secondly, tobacco tar produced by tobacco combustion will lead to the decline of vitamin B12 which is the essential nutrient to maintain the normal function of the optic nerve. Influenced by these two reasons, smokers may result in vision loss or amblyopia or even blindness.

In addition, scientific research had also made it clear that tobacco can lead to wrinkles around the eyes. Even if you do not smoke, please do not relax your vigilance. “Second-hand cigarette” and “third-hand smoke” will also destroy your body and appearance.

3.Dry Eyes

The reporter has learned that in ST.PAOLO ophthalmic hospital in Columbia city, there are many patients who suffered from eyes dry, eyes itch or sting, and eyestrain. Dr.Northem said that these are the typical symptoms of dry eyes. The major patients are students, IT professionals, office workers and drivers.

A doctor told the reporter that healthy eyes will naturally secrete tears to lubricate eyeballs. The water in eyes will evaporate more quickly in dry weather. In addition, environment pollution, long-term use of air-conditioning and over-worked eyes will also increase tear loss and dry eyes.

4.Excessive Sunbathing

Excessive ultraviolet irradiation will bring about the eye wrinkles, cataracts and other eye diseases. Hence, please wear sunglasses or UV glasses to well protect your eyes when you are outdoors.

5.Untimely Replacement of Makeup

The invasion of bacteria and viruses begins with the opening of a new eyelash, eyeliner, or kohl. Repeated use of these makeups will increase the bacteria which will cause the infection and even more serious results once it enters the eyes. It is suggested that the makeup should be replaced within 6 months; eyelash should be replaced within 3 months.

6.Inappropriate Dieting

The improper dieting will threaten the health of eyes. Studies have shown that fresh vegetables and fruits are rich in vitamin E and C, carotene and zinc which are helpful in preventing some eye diseases and wrinkles. To dieters, it is right to reduce the adipose and starch ingestion. At the same time, dieters must increase the intake of vegetables and fruits instead of considering them as a dinner.

7.Poor Sleep

If you often stay up until 2 to 3 o’clock early in the morning, and you have to rush to work at 8 o’clock in the morning, you will be defeated by insufficient sleep. In order to get rid of pouch, black eyes and wrinkles, you’d better seize every opportunity to take a short nap.

Popularity: 10% [?]