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Different Types of Prescription Lenses for Spectacles

Back to Prescription Lens Help Main Menu

What are single vision distance, single vision near lenses?  
What are Bifocal lenses?
What are Multifocal (Progressive) lenses?
What are Computer lenses?
What type of lenses should I choose?
Free Form Multifocal (Progressive) lens design
Ordering Multifocal (Progressive) or Computer Access Lenses with E Try-on™
Adjust to the New Progressive Lenses

What are single vision distance, single vision near lenses?
Single Vision Distance Single Vision Near
Single Vision Distance glasses are used to improve vision for viewing objects at distance, for example, for driving. This is usually required for people over 40 years old for reading and other close-up work. Most people aged 40 and over may find intermediate and distance vision is blurry.
Single Vision Near, i.e. reading glasses lenses - provide a presbyopic wearer with clear near vision.


What are Bifocal lenses?
Bifocal Lenses have both distance and near correction in one lens with visible lines separate the two. The upper section is for distance vision. A small portion of the eyeglass lens below the line is for near vision correction. Generally, you look ahead or up through the upper section of the lens to look at objects at distance, and you look down and through the near segment of the lens to look at the reading material or close-up work at a distance of up to about 45 centimetres away.
Bifocal Lenses are convenient alternatives for people over 40 years old who require separate glasses for distance and near vision. There are certain requirements on the frame for bifocal glasses. Please follow this bifocal glasses link for a list of frames that are suitable for bifocal glasses.

What are Multifocal (Progressive) lenses?
Multifocal lenses provide vision correction from distance through intermediate to near Multifocal Lenses, also called Progressive lenses have corrective powers change progressively throughout the lens. They are another convenient alternatives for people over 40 years old who require separate glasses for distance and near vision. A wearer looks through the top portion of the lens for distance vision, middle portion for intermediate vision, and the lower portion for reading or close work. Each area is blended invisibly into the next, without the lines that traditional bifocals or trifocals have.

Multifocal Lenses provide a smooth transition from distance through intermediate to near, with all the in-between corrections included as well. This constant graduation of the prescription means that you can look ahead through the top section to see in the distance, drop your gaze downward slightly through the middle section to view objects in the intermediate zone (around 65 centimetres away), and drop your gaze further down to read and do fine close up work comfortably.

There are certain requirements on the frame for multifocal glasses. Please follow this multifocal glasses link for a list of frames that are suitable for Multifocal glasses.
multifocal lenses allow you to see distance, intermediate and near in one lens.

What are computer lenses?
Computer Lenses provide large viewing area for intermediate and near distance Computer lenses, also called "extended readers" or "near progressive" lenses, are special progressive lenses designed for people requiring intermediate and near focus, for example, when using computer or when playing music. Unlike regular progressive lenses, it has large viewing area for intermediate distance (around 65 centimetres away) which allows wearers to see intermediate distance objects, for example, the entire computer screen, the music sheet on the music sheet stand comfortably.
Computer lens provides extra-wide intermediate vision vision through the top of the lens, transitioning to extra wide near Vision through the bottom of the lens Depending on age and prescription, some people may find multifocal lenses do not provide enough viewing area for intermediate distance, for example computer screen. Computer lenses allow you to see the entire computer screen and reading material comfortably.
Computer lens provides extra-wide near vision through the bottom of the lens, transitioning to extra wide intermediate vision through the top of the lens. So wearers get a wide, clear, uninterrupted view of their entire work space – from the keyboard and reading materials in front of them, to the monitor. Depending on the prescription, for most people, it can't be used for driving or for other activities that require clear distance vision.

Computer lenses are an ideal specialized pair for presbyopes and emerging presbyopes who require intermediate distance focus, for example, when using computers, reading music sheet on the stand; and who wear single vision, multifocal or bifocal glasses.

Please note Intermediate Add value is determined based on the Near Add and your age for approximately 65cm distance. You may need to adjust the distance to the monitor slightly to find a clear intermediate focus.

There are certain requirements on the frame for computer glasses. Please follow this computer glasses link for a list of frames that are suitable for computer glasses.
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What type of lenses should I choose?
You most likely only require single vision distance or single vision near type of lenses before you reach 40 years old.

Once you reach 40 years old, the focusing ability of your eyes declines due to presbyopia. You will require a separate pair of glasses with single vision near lenses for close-up work.

If you are over 40 years old, are near sighted or far sighted, you probably don't like the idea of having to bring two pairs of glasses (single vision distance for driving, single vision near for close-up work). Then a pair of glasses with bifocal lenses or multifocal lenses would be much more convenient as they allow you to see both distance and near without having to change the glasses. Once you are used to the multifocal lenses, you will find them much more comfortable to wear because Multifocal Lenses provide a smooth transition from distance through intermediate to near. Multifocal lenses have better cosmetic appearance than bifocal lenses because they don't have visible lines on the lenses.

If you are over 40 years old, a regular computer user or music player, are near sighted or far sighted, you may find multifocal lenses do not provide enough coverage on the computer screen which is usually at intermediate distance of 65cm. A pair of glasses with computer lenses will give you large wide view on the computer screen or the music sheet (intermediate distance) and allow you to read the close-up material in front of you (near distance).

Remember your optometrist is the best person to ask about the type of lenses to choose for your lifestyle and vision needs. Your optometrist should be able to demonstrate the result of different types of lenses. Please consult your optometrist if you are unsure what is the best type of lenses for you.
Free Form Multifocal (Progressive) lens design
All the multifocal lenses we provide are technologically advanced free form multifocal lenses. Free Form multifocal lenses use the back surface grind lens design. This design brings the progressive side of the lens closer to your eye, giving you wider fields of vision through all lens zones. Free from multifocal lenses provide clearer and wider view with lower distortion compare with traditional multifocal lenses, which means you will quickly adapt to the lens and experience unsurpassed vision comfort.
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Ordering Multifocal (Progressive) or Computer Access Lenses on Internet Made Easy with E Try-on™, it totally takes away the guess work.

We have developed a built-in mathematical measurement system into the E Try-on™ software. The data gathered during E Try-on™ helps us to determine the optimal position of the reading or fitting height of a progressive lens and computer access lens. Your Multifocal (Progressive) and computer access lenses can be done just as accurately as if you were in an optical store on the street.

We strongly recommend you to submit your portrait photo to try-on the glasses for Progressive Lens or Computer Access Lens order. The E Try-on™ program collects the data that is necessary for fitting progressive or Computer Access lenses. For instruction on the requirement of the photo, please visit E Try-on® guide.

Adjust to the New Progressive Lenses
Please allow one week to adjust to your new progressive lenses. Even if you have worn glasses with progressive lenses before, because the new glasses may not have the same design as your old one, it may take you a while to get use to the new glasses.

The tip is to sit down then put on your new progressive glasses. Don’t walk with the new glasses immediately, only walk around when you feel comfortable. If you still fell uncomfortable after 10 days, please contact us with your order number.

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