Why Are Prescription Lenses Used and When?

Sometimes when a person realises that they require glasses, they could simply choose a pair 'off the shelf' and get them.

California, AZ (prHWY.com) April 28, 2011 - Sometimes when a person realises that they require glasses, they could simply choose a pair 'off the shelf' and get them. However, in some instances these glasses aren't sufficient to correct an individual's visual impairment, whereby Prescription Lenses are usually necesary.

Prescription lenses are just prescribed to someone following a watch test conducted by an optician or optometrist, who'll deem whether the patient's vision is impaired to this kind of extent that he or she requires a unique prescription to satisfy their requirement and hopefully correct their individual visual problems.

When writing a prescription for lenses, the optician or optometrist takes into consideration not just the physical state of both eyes, but also the effectiveness of the patient's near and far distance vision. The patient's unique Physiognomy with regard to eyes, like the space between the cornea and also the lens can also be incorporated to make a unique prescription.

There is a number of providers of prescription lenses who are able to produce lenses that may meet almost any necessity of any user since no two people's eyes are identical. For example, bifocal lenses combine both distance and reading distances into a single lens having a dividing line. Which means that the consumer has effectively two pairs of glasses in a single as they are able to see within the distance in addition to read items close up. This is especially useful when the user reaches middle age, the stage when humans typically suffer from 'presbyopia', meaning that we're not able to focus on an item close up.

Progressive or 'varifocal' lenses however are similar to bifocals for the reason that they allow the user to see both long and short distances. However, unlike bifocals, they don't have a dividing line because they the prescriptions are blended into a single lens. This in turn allows the consumer to also focus on middle-distance objects such as computer screens and notice boards.

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