If you are thinking to move on from your classic eyeglasses to the trendy contact lenses, you might be wondering, whether both of the prescriptions are all the same. You might prefer to use the old prescription for your eyeglasses, rather than doing the new eye examination. Unfortunately, the contact lens prescription is mostly different than the eyeglasses prescription.
A professional optician will measure your eye vision accurately, to determine the appropriate lenses or eyeglasses that can make your vision clearer. Both items are capable of correcting the typical refractive errors such as myopia (shortsightedness), hyperopia (farsightedness), astigmatism and presbyopia. Both astigmatism and presbyopia require a specific lens that is specifically designed to tackle those eye vision problems. Patients with astigmatism need a toric lens, while patients with presbyopia require a multifocal lens.
If you use your eyeglasses prescription to purchase contact lenses online, it will not guarantee you the same visual acuity. That’s why you can’t switch both prescriptions from one to another. Moreover, if someone is wearing eyeglasses, doesn’t necessarily mean that he or she can also use contact lenses. Because the contact lenses might be inappropriate for those, whose eye’s sensitivity level is quite high or whose vision is complex. Those people might face an eye hazard, if they want to switch to contact lenses. Therefore, we highly recommend you to call for advices from an expert, before ordering a contact lens.
Furthermore, eyeglasses prescription isn’t suitable to contact lenses because of the different wearing method. Different than eyeglasses, contact lenses should be placed firmly on the surface of the eye. While eyeglasses are usually remain away about 12 millimeters from the eye. Therefore, we can’t equalize both eyeglasses and contact lenses prescriptions.
Besides, a contact lenses prescription contains some additional specific measurement that you can’t find on an eyeglasses prescription, such as:
- Base curve: this measurement is designed base on your eye’s natural curvature. So you can place the lenses perfectly secured on the surface of your eyes.
- Diameter: this is your contact lenses width.
- Lens material: there are two kind of contact lenses material, such as hydrogel and silicone hydrogel contacts. The silicone hydrogel one is usually suitable for those sensitive or dry eyes, because it will keep your eyes hydrated.
- Expiration date: this identifies how long your lenses are valid to use.
Meanwhile, both eyeglasses and contact lenses equally consist of two specifications, such as:
- Cylinder: this identifies the additional amount of eyesight correction required to treat astigmatism.
- Axis: this number indicates the required angle of your correction. It is usually written in degrees.
Keep in mind that you have a right to obtain a copy of your eyeglasses or contact lenses prescription. If you already received a specific prescription for contact lens, then you can begin to seek the right contact lens that is comfortable and suitable for you. We recommend you to look for it on the internet, as you can find numerous contact lenses retailers, and then you can pick the most proper and affordable one in your best interest.