yes but it would feel wierd.
No, it can't be used. It will cause irritation in your eyes. Also visibility will not be clear.
Yes, discount contact lens can still match your prescription exactly. All companies have quality standards that they have to meet, so regardless of where you purchase your prescription lens, you will get the same prescription all the time.
no. but you can't buy contact lens in the US without a prescription.
plano lenses
Yes the contact lens is a medical device and you need a prescription form an eye doctor to order them (especially online).
92311prescription of optical and physical characteristics of and fitting of contact lens, with medical supervision of adaptation; corneal lens for aphakia, 1 eye92312 prescription of optical and physical characteristics of and fitting of contact lens, with medical supervision of adaptation; corneal lens for aphakia, both eyes92313 prescription of optical and physical characteristics of and fitting of contact lens, with medical supervision of adaptation; corneoscleral lens
The shorter the focal length of a lens, the smaller the real images that it produces. The diameter of the lens is irrelevant.
The base curve is the radius of the sphere of the back of the lens that the prescription describes.
The diameter of the lens prescribed is specific to the shape of your eye. If you use contacts of the incorrect size, irritation and/or blurriness may occur, and they may be prone to falling out of your eye during normal use. Use the measurements prescribed by your optometrist. It's the reason prescriptions are required to buy them.
The amount of curve (convex) in the lens determines the strength of the lens, thereby determining the effectiveness (or strength) of the lens. This is how the prescription strength of contact lenses is determined.
Yes.
Lenses can be custom made in any prescription, but most soft lens companies manufacture a range of the most common prescriptions, between +8.00 to -8.00 and others range from -20.00 to - 20.00.