Astigmatism is caused by irregular corneal pattern, 270 degrees of astigmatism, the degree is still relatively large, belongs to the moderate astigmatism, this condition will have a more obvious impact on the naked eye vision. Therefore, when this condition exists in the eyes, you need to go to the hospital for an early optometry examination and accurate prescription of glasses, which can effectively improve the corrected visual acuity, ensure good visual quality, and effectively reduce the occurrence of eye fatigue. In addition, astigmatism can be divided into two types depending on the cause: the first is physiological astigmatism, which is caused by the irregular development of the cornea at birth and usually does not change in degree with age. The second type is acquired astigmatism, secondary to corneal diseases, such as cone cornea and corneal scar, etc. Astigmatism in this case may gradually increase with age, so regular visits to the hospital for vision and optometry examinations are required.