When you see something and your vision is blurred, you may be exposed to a minus eye or a cylinder. However, although both make the view blurred, the minus eye (myopia) and cylinder (astigmatism) are different eye diseases. Want to know what are the minus and cylinder eye differences? Come on, see the following review.
Difference between minus eye and cylinder
1. The cause of the view is blurred
In the minus eye, the cause of the view becomes blurred is that the curvature of the cornea is too large so that the incoming light cannot focus. The unfocused light does not finally fall right on the retina, but falls in front of the retina. As a result, the view becomes unclear or blurred.
Unlike the minus eye, the eyes of the cylinder are blurred because of the disability in the shape of the cornea and irregular silence. The curvature can change the incoming light or refract the light. As a result, light does not fall right on the retina, but in front of or behind the retina. As a result, the eyes cannot see objects clearly.
When looking at an object, the sight of a minus eye sufferer will appear blurred and the head feels dizzy. Whereas people with cylindrical eyes when looking at an object, not only their vision is blurred and causes dizziness, but also shadows and the shape of the object becomes unclear (eg straight lines appear to be slanted). This is because there is reverse refraction of light by the cornea.
Minus and cylinder eyes can occur due to hereditary factors. But besides heredity, minus eyes and cylinders can also occur by several other things. Reported from Healthline, the National Eye Institute concluded that minus eyes often occur in children aged 8-12 years. This happens along with the development of the shape of the eye.
So, adults who have minus eyes, usually have this eye damage from a small age. In addition, health conditions can also lead to the occurrence of minus eyes, such as diabetes.
While the cylindrical eye usually occurs due to continued severe minus eye damage, cataract removal surgery, and also suffering from keratoconus (corneal degeneration).
4. Lens used
To overcome the minus eye, the glasses used must have a concave lens or a negative lens. Concave lenses help reduce the corneal curvature that is too large so that light can focus and fall right on the retina. While the cylinder eye can be overcome with cylindrical glasses. The cylindrical lens helps to combine several shadows due to refraction into one shadow so that the view is no longer blurred.
5. Eye damage condition
Although the minus eye can be overcome by using glasses or a lens box. However, the condition of the minus eye can increase until the patient is 18 or 20 years old. This can happen because the sufferer does not maintain eye health, for example, too often staring at a computer screen or cellphone.
While cylindrical eyes tend not to increase if the sufferer uses glasses or a box lens that fits the size. So, if the patient with the cylinder is given the right glasses or contact lenses, the size of the cylinder will not increase.
6. Treatment is
The minus eye and cylinder can be treated by doing refractive surgery or laser eye surgery. This operation can treat both eye diseases permanently.
However, in the cylindrical eye another treatment can be carried out, namely orthokeratology (the use of rigid contact lenses) to correct irregular curvature of the cornea.
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