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Symptoms to look out for:
The three most common refractive errors are
Prescriptions are written in units called diopters, they are measured in intervals of 0.25 steps and will either positive (+) or negative (-)
Sphere: If you suffer from Myopia( short sightedness) the prescription will be negative (e.g -1.00, -1.25,-1.50), if you have hyperopia ( long sightedness) the prescription will be positive (e.g +1.00, +1.25, +1.50). The higher the number the stronger the prescription.
Cylinder: If you have astigmatism, this simply denotes the amount of diopters (or degrees) between your corneas deepest and shallowest curves.
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