astigmatic glasses的意思|示意

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Astigmatic glasses, also known as eyeglasses for astigmatism, are glasses specifically designed for people suffering from astigmatism. Astigmatism is an optical condition characterized by an irregular curvature of the cornea. This causes images to be blurred due to the inability of light rays to focus properly on the retina. Astigmatic glasses are worn to correct the refractive error and continuously update the prescription to make sure the user can see clearly.

Astigmatic glasses are typically made up of two lenses provided with different curvature. The curvature is determined by the individual’s prescription and this reflects an appropriate level of optics for the condition. Typically, the shape of the glasses is round. Astigmatic lenses are usually made with a special plastic material that has the ability to resist fatigue and deformation.

The effectiveness of astigmatic glasses can be judged in two ways, namely, by using a retinoscope and by using a corneal topography. Retinoscopy is a method used to test the smoothness and regularity of the eye’s focus. It is done by having the person look at a target while the optometrist shines a light into the eye. Corneal topography is an evaluation of the eye’s surface using a computer-assisted imaging technique. This technique is used to detect any irregularities in the curvature of the cornea.

In order to use astigmatic glasses, one needs to possess a valid optometrist prescription. This prescription should be taken to the optica for fitting and assessment. The glasses should be aligned properly with the eyes and the frames should be adjusted according to the size of the head. The most important factor for effective use of astigmatic glasses lies in the choice of the frames. It is important to choose frames that occupy a large area of the face, increasing the field of vision.

Astigmatic glasses are essential for people suffering from astigmatism. They correct the refractive error and help improve vision. With the correct prescription and properly fitted glasses, one can enjoy clear and sharp vision.