Adição cilindro
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Cylinder Addition Calculator is an online tool used to calculate the degree of astigmatism, also known as cylinder, in an eye exam. It adds the spherical and cylindrical degrees to provide an accurate measure of the necessary correction. The formula used is simple: add the spherical degree value to the cylindrical degree value, considering the orientation of the cylinder axis.
Astigmatism is a refractive problem that occurs when the cornea or lens of the eye has an irregular shape, preventing light from being focused correctly on the retina. Adding the cylinder is essential to correct this problem and ensure clear vision. The calculator helps determine the correct prescription for lenses or glasses.
It is essential to use this calculator in cases of astigmatism when cylindrical correction is needed. Additionally, it is crucial to have regular eye exams to detect any changes in vision and adjust the prescription as necessary. The calculator serves as an auxiliary tool but does not replace the evaluation of a healthcare professional.
When using the Cylinder Addition Calculator, it is crucial to have recent and accurate eye exam results. The correct interpretation of the results depends on understanding the obtained values and proper guidance from an optometrist or ophthalmologist.
Frequently asked questions
What is astigmatism and how is it corrected?
Astigmatism is a refractive problem caused by an irregular shape of the cornea or lens. It is corrected with lenses or glasses that have a specific cylindrical correction.
How does cylinder addition work?
Cylinder addition involves adding the spherical degree and cylindrical degree to obtain the total correction needed for clear vision.
Can I use the calculator to determine my prescription?
No, the calculator is an auxiliary tool. Only a healthcare professional can determine the correct prescription after an eye exam.
What are the precautions when using the calculator?
It is essential to have accurate and recent eye exam results and seek guidance from an optometrist or ophthalmologist for correct interpretation of the results.
When should I have an eye exam?
It is recommended to have eye exams regularly, especially if you have a history of vision problems or notice changes in your vision.