For contact lenses, the choice of the degree is very important. Once you make a mistake in the choice of the degree, it may cause dizziness, deepening of the degree, affect the wearing comfort, and may also cause some eye diseases. So, how to choose the degree of contact lens?
The first thing to do is to go to a regular hospital or optician to receive a refractive examination before getting glasses. Only by knowing the eye condition in detail can it be judged whether it is suitable for wearing contact lenses, and the appropriate lens can be selected according to the accuracy of the measurement to obtain the best corrected vision.
If the wearer knows his own accuracy, he can also use the conversion method to get glasses directly. Under normal circumstances, the power of frame glasses is slightly higher than that of contact lenses. In the conversion process, it is necessary to subtract 25-50 degrees according to the specific power. However, there may be errors in the use of this method to match the lens, and it may also cause some discomforts because of the failure to consider the base arc and astigmatism.
When a patient with astigmatism wants to wear contact lenses, the degree of astigmatism should be determined first. If the degree of astigmatism is less than 75 degrees and does not affect normal vision, ordinary contact lenses can be used to correct; but if the degree of astigmatism is high, or it has affected daily life, you should choose professional astigmatism contact lenses to carry out Correct. At present, some spectacle shops use astigmatism to convert into myopia for fitting glasses, which is an irregular fitting method.
Wearing contact lenses, especially in the first few months of wearing them, should go to the hospital for eye examinations regularly to ensure that they are suitable for wearing contact lenses and to avoid errors in the prescription of lenses.