1. Heim
  3. Lens Functions

Lens Functions

1.   Single vision lens

Single-vision optical lenses are for people who need to correct one field of vision, either for distance, intermediate (computer), or near vision (reading). They contain the same amount of vision correction throughout the entire lens. There is no ADD in the optical in the single vision optical and there are no lens height requirements for single vision optical.

2.   Bifocals

Bifocals (sometimes called “lined bifocals”) contain two optical within the same lens and can correct both nearsight and farsight vision requirements.  The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision. The contrasting lense sare separated by a noticeable line.

3.   Progressives

Progressives are multifocal lenses that contain at least three optical. They have 3 main fields of vision, including near, intermediate, and distance. However, progressives do not have a visible line between optical. This gives the wearer a seamless and uninterrupted transition when looking from up-close objects to far-away distance.

 

Advanced Progressive lens

Advanced Progressive lenses are the most popular type of high definition lenses and are made by free form technology that can allow you to achieve better optics. The progressives are added on the backside of the lens to enlarge visual fields and minimize the uncomfortable effects. Comparing these with the standard progressive lens, Advanced Progressive lenses are easier to get used to.

4.   Computer lenses

The lenses of computer glasses are designed to deal with eyestrain caused by prolonged hours staring at computer screens. Computer glasses help with an intermediate distance of around 20 to 26 inches, which is the distance most people sit from their monitor. Many computer glasses have light yellow/brown tinted lenses to block out blue light radiating from your electronic devices.

 

5.   Reading glasses

Reading glasses are made primarily for presbyopia which is an age-related eye disease most people experience around 35 to 45 years of age. Presbyopia is caused by a decreased elasticity in the eye's lens, making it more difficult to focus on objects in a close range.

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How to measure PD?

Your PD may be written in three ways:
1. PD (OU), written as "64", means the Binocular PD which is for both eyes. 

2. DUAL PD, or monocular PD, consists of two numbers and is the distance between the centers of each pupil to the bridge of the nose
Dual PD is written as two numbers, for example, "32/32", the first one "32" represents the PD for the right eye, and the second one "32" represents the PD for the left eye. 

3. Sometimes PD is written as "62/59" or they are labeled "Far" and "Near". Your PD is usually measured for distance vision, which is 'Far PD", or "62" in this example. For reading glasses, doctors measure your "Near PD" or "59" in the example.
Always enter your "Far PD" for distance vision eyeglasses and enter your 'Near PD" for your reading glasses only. For most people, the difference between Far PD and Near PD is about 2-3mm.

What is ADD?

The ADD—short for Reading Addition—is the additional correction required for reading. It can be used to make either reading glasses, bifocal glasses or multifocal glasses. If you wish to choose bifocal/progressive lenses, the ADD number should be included in your Optical.

The "addition" is only required if the glasses are going to be used for reading or close work. Please kindly note that if you have ADD and choose distance glasses, the glasses can only be used for seeing far, not available for reading. Sometimes opticians use the word "Add" or "Near" instead of "addition". They may only write it once, but it normally applies to both eyes and is almost always the same value for both eyes (e.g. 'Add' +2.50 - should be entered for both eyes).

Here is a reference.

Age        Add Power
35-39     Plano
40-44     +1.00
45-49     +1.50
50-54     +2.00
55-59     +2.50
60-64     +3.00

Lens Functions

1.   Single vision lens

Single-vision optical lenses are for people who need to correct one field of vision, either for distance, intermediate (computer), or near vision (reading). They contain the same amount of vision correction throughout the entire lens. There is no ADD in the optical in the single vision optical and there are no lens height requirements for single vision optical.

2.   Bifocals

Bifocals (sometimes called “lined bifocals”) contain two optical within the same lens and can correct both nearsight and farsight vision requirements.  The top portion of the lens is used for distance, while the bottom portion of the lens is used for closer vision. The contrasting lense sare separated by a noticeable line.

3.   Progressives

Progressives are multifocal lenses that contain at least three optical. They have 3 main fields of vision, including near, intermediate, and distance. However, progressives do not have a visible line between optical. This gives the wearer a seamless and uninterrupted transition when looking from up-close objects to far-away distance.

 

Advanced Progressive lens

Advanced Progressive lenses are the most popular type of high definition lenses and are made by free form technology that can allow you to achieve better optics. The progressives are added on the backside of the lens to enlarge visual fields and minimize the uncomfortable effects. Comparing these with the standard progressive lens, Advanced Progressive lenses are easier to get used to.

4.   Computer lenses

The lenses of computer glasses are designed to deal with eyestrain caused by prolonged hours staring at computer screens. Computer glasses help with an intermediate distance of around 20 to 26 inches, which is the distance most people sit from their monitor. Many computer glasses have light yellow/brown tinted lenses to block out blue light radiating from your electronic devices.

 

5.   Reading glasses

Reading glasses are made primarily for presbyopia which is an age-related eye disease most people experience around 35 to 45 years of age. Presbyopia is caused by a decreased elasticity in the eye's lens, making it more difficult to focus on objects in a close range.

Lens Thickness/ Lens Index

a.    Standard Spheric 1.50 Lens
 

Standard index 1.50 lenses are spheric lenses, they come an with anti-scratch hard coating and 85-90% UV protection coating (Please choose higher index lenses to get 100% UV protection), and are shatter-resistant, suitable for spherical power +/-1.00 or below, and cylindrical power +/-1.00 or below.
 

b.    Super Flex Aspheric 1.56 Lens
 

Super flex 1.56 lenses are super light and highly impact-resistant with a 100% UV protection coating. These lenses are recommended for rimless and sports eyeglasses. The lenses are suitable for a spherical power of +2.00~+4.00/-2.00~-3.00 or below with cylindrical power +/-2.00 or below.
 

c.   Thin Spheric 1.56 Lens
 

Thin Spheric (1.56) lenses come with an anti-scratch hard coating and 85-90% UV protection coating (Please choose higher index lenses to get 100% UV protection). The higher index lens greatly reduces the thickness of the lens edge, and they are suitable for spherical power of +2.00~+4.00/-2.00~-3.00 or below, and cylindrical power of +/-2.00 or below.
 

d.   Super Flex Aspheric 1.60 Lens
 

Super flex 1.60 lenses are super light and highly impact-resistant with an anti-scratch hard coating and 100% UV protection coating. These lenses are recommended for rimless and sports eyeglasses. High index is suitable for spherical power of +4.00~+6.00/-3.00~-6.00 or below with cylindrical power +/-2.00 or to +/-3.00.

e.   Polycarbonate Aspheric 1.59 Lens

Polycarbonate(PC) lenses are lightweight, comfortable and the most impact-resistant, with an anti-scratch hard coating and 100% UV protection coating. They are the best choice for children's glasses, safety glasses and sports eyewear. It is recommended for spherical power of +2.00~+3.00/-3.00~-6.00 with cylindrical power of +/-4.50 or below.
 

f.   Advanced-Thin Aspheric 1.60 Lens
 

Advanced-Thin Aspheric (1.60) lenses are high index lenses with an anti-scratch hard coating and 100% UV protection coating which are suitable for wearers with spherical power from +4.00~+6.00/-3.00~-6.00, and with cylindrical power from +/-2.00 to +/-3.00.
 

g.    Super Thin 1.67 Aspheric Lens
 

Super Thin Aspheric (1.67) lenses are light, thin and scratch-resistant with a 100% UV protection coating. Also, they are more impact-resistant than CR-39 resin lenses. They provide optical performance similar to glass lenses, as MR-7 lenses have a high index and Abbe number. The lenses are suitable for strong

a.    Standard Spheric 1.50 Lens
 

Standard index 1.50 lenses are spheric lenses, they come an with anti-scratch hard coating and 85-90% UV protection coating (Please choose higher index lenses to get 100% UV protection), and are shatter-resistant, suitable for spherical power +/-1.00 or below, and cylindrical power +/-1.00 or below.
 

b.    Super Flex Aspheric 1.56 Lens
 

Super flex 1.56 lenses are super light and highly impact-resistant with a 100% UV protection coating. These lenses are recommended for rimless and sports eyeglasses. The lenses are suitable for a spherical power of +2.00~+4.00/-2.00~-3.00 or below with cylindrical power +/-2.00 or below.
 

c.   Thin Spheric 1.56 Lens
 

Thin Spheric (1.56) lenses come with an anti-scratch hard coating and 85-90% UV protection coating (Please choose higher index lenses to get 100% UV protection). The higher index lens greatly reduces the thickness of the lens edge, and they are suitable for spherical power of +2.00~+4.00/-2.00~-3.00 or below, and cylindrical power of +/-2.00 or below.
 

d.   Super Flex Aspheric 1.60 Lens
 

Super flex 1.60 lenses are super light and highly impact-resistant with an anti-scratch hard coating and 100% UV protection coating. These lenses are recommended for rimless and sports eyeglasses. High index is suitable for spherical power of +4.00~+6.00/-3.00~-6.00 or below with cylindrical power +/-2.00 or to +/-3.00.

e.   Polycarbonate Aspheric 1.59 Lens

Polycarbonate(PC) lenses are lightweight, comfortable and the most impact-resistant, with an anti-scratch hard coating and 100% UV protection coating. They are the best choice for children's glasses, safety glasses and sports eyewear. It is recommended for spherical power of +2.00~+3.00/-3.00~-6.00 with cylindrical power of +/-4.50 or below.
 

f.   Advanced-Thin Aspheric 1.60 Lens
 

Advanced-Thin Aspheric (1.60) lenses are high index lenses with an anti-scratch hard coating and 100% UV protection coating which are suitable for wearers with spherical power from +4.00~+6.00/-3.00~-6.00, and with cylindrical power from +/-2.00 to +/-3.00.
 

g.    Super Thin 1.67 Aspheric Lens
 

Super Thin Aspheric (1.67) lenses are light, thin and scratch-resistant with a 100% UV protection coating. Also, they are more impact-resistant than CR-39 resin lenses. They provide optical performance similar to glass lenses, as MR-7 lenses have a high index and Abbe number. The lenses are suitable for strong optical, with spherical power from +/-6.00~+/-9.00 and cylindrical power from +/-3.00 to +/- 4.00.
 

h.   Ultra Thin 1.74 Aspheric Lens
 

Ultra Thin Aspheric(1.74) lenses come with a 100% UV protection coating and they are suitable for strong

 

A specific example is shown below on the indexing of a -4.00-lens optical on how thin the lens could be.

How to choose lenses?

This predominantly depends on the strength of your optical. The higher the optical, the higher index is required for ensuring your lenses are as light and thin as possible. 

Here is a picture for reference:


A specific example is shown below on the indexing of a -4.00-lens optical on how thin the lens could be.

Each lens type is made from different materials. The higher index materials allow for flatter curved lenses that are still able to maintain an aspheric design. Both of these features help produce thinner and lighter lenses.

Please note: The ultimate thickness of the lenses is determined by the frame size (including lens height, lens width), frame material and your PD. If you choose a big frame the lens edge will undoubtedly be thick. Frames with thin metal rim will also make the lens look thicker. If the frame is not the best for your PD, the lens may not be beautiful and thin as you expect. 

What is the difference between single-vision and bifocal/progressive lenses?

Single vision lenses refer to lenses that have only one use, to see objects in the distance,  to see intermediate like computer or phone, or to see near for reading (reading glasses), while bifocals/progressives is a type of optical that can be used to correct both near and farsight requirements. This means you can see your whole field of vision without switching between multiple pairs of glasses.

Knowledge about Eyeglasses Optical

1. Myopia

Myopia, or nearsightedness, is the most common refractive error of the eye. If you are nearsighted, you typically will have difficulty in seeing distant objects clearly but will be able to see well for close-up tasks such as reading and computer use. If there is a minus in your SPH, it means you have myopia (nearsightedness).
Rx:

2. Hyperopia

Hyperopia, or farsightedness, is a common vision problem, affecting about a fourth of the population. People with hyperopia need correction focusing on objects that are both up close and far, and often feel eyestrain. The condition is sometimes referred to as "hypermetropia" rather than hyperopia. If there is a plus in your SPH, it means you have hyperopia (farsightedness).
Rx:

3. Presbyopia 

Presbyopia is when your eyes gradually lose the ability to see things clearly up close. It is a normal part of aging. In fact, the word "presbyopia" means "old eye" in Greek. You may start to notice presbyopia shortly after age 40. You will probably find that you hold reading materials farther away in order to see them clearly.
Rx:

4. Astigmatism

Astigmatism is a common vision problem caused by an error in the shape of the cornea. With astigmatism, the lens of the eye or the cornea, which is the front surface of the eye, has an irregular curve. This can change the way light passes, or refracts, to your retina. This causes blurry, fuzzy, or distorted vision.
 

5. ADD (Addition)

The Add, short for Reading Addition, is the additional correction required for reading. It can be used to make either reading glasses, bifocal glasses or multifocal glasses. If you choose the bifocal/progressive lens, the ADD number should be included in your optical. 

The 'addition' is only required if the glasses are going to be used for reading or close work. If your glasses are for distance only, this will not be an issue. Please kindly note that if you have ADD and choose distance glasses, the glasses can only be used for seeing far, not available for reading. Sometimes opticians use the word 'Add' or 'Near' instead of 'addition'. They may only write it once, but it normally applies to both eyes and is almost always the same value for both eyes (e.g. 'Add' +2.50 - should be entered for both eyes).

Age        Add Power
35-39     Plano
40-44     +1.00
45-49     +1.50
50-54     +2.00
55-59     +2.50
60-64     +3.00
 

6. SPH (Sphere/Spherical)

SPH (Sphere) indicates the amount of lens power, prescribed to correct nearsightedness or farsightedness. If the number appearing under this heading has a minus sign (–), you are nearsighted; if the number has a plus sign (+) or is not preceded by a plus sign or a minus sign, you are farsighted.  The larger the number following the +/-, the stronger the Optical.
 

7. CYL (Cylinder/Cylindrical)

CYL (Cylinder) indicates the amount of lens power for astigmatism. This number also has "+" or "-" signs. If "DS" or"SPH" or "spherical" or "PL" is stated at the place of CYL, it means you have no astigmatism. 
 

8. Axis

The axis indicates the orientation of astigmatism, measured in degrees from 1 to 180. If an eyeglass optical includes cylinder power, it also must include an axis value, which follows the cylinder power.
 

9. OD. OS .OU

"OD" and OS" are abbreviations for oculus dexter and oculus sinister, which are Latin terms for the right eye and the left eye.
Your eyeglass optical also may have a column labeled "OU." This is the abbreviation for the Latin term oculus uterque, which means "both eyes."
Some doctors and clinics have opted to modernize their opticals and use RE (right eye) and LE (left eye) instead of OD and OS.
On your eyeglasses optical, the information for your right eye (OD) comes before the information for your left eye (OS). 

 

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Return & Exchange

Return & Exchange Policy

 

365-Day Warranty: Customers will enjoy a 365 days warranty (365 days from the date of receipt), covering any possible defect in materials and workmanship. This warranty does not cover damage caused by accidents, negligence, or improper care.

30-Day Exchange & Return: Unsatisfactory glasses can be exchanged or refunded within 60 days of receipt. Only shipping fees will apply. Each order is eligible for a one-time exchange/return. Please kindly note that the ''exchange order'' is not eligible for another exchange/return.
 

Shipping and Tracking

DOMESTIC SHIPPING:

All domestic orders ship free with Standard Shipping. We want to get your order to you as quickly as we can. Your order will be shipped within 2 business days (Monday – Friday). If your item is not located within our fulfillment center and needs to be retrieved from one of our retail locations, please allow an additional business day for processing before shipping. We does not deliver to P.O. boxes. See our returns policy.

PRODUCTION TIME 

 

ITEM PRODUCTION TIME
Glasses frames only 2 days
Glasses frames with single vision lenses 3 to 5 days
Glasses frames with Transitions, progressive lenses, or lenses with special coating 5 to 7 days
Sports sunglasses with single vision lenses 5 to 7 days

 

SHIPPING TIME

 

Ship to Standard Shipment Standard Time Express Shipment

Express Time
United States Free  14 - 30 days $20

3 to 9 days
Asia, Australia, Norway, New Zealand, Switzerland, United Kingdom Free 14 - 30 days $30

3 to 9 days
Other Countries Free 14 - 30 days $60

3 to 9 days

All Optical orders have a processing time of 5–7 business days.

FOR MORE INFORMATION:

  • Please make sure the shipping address is correct. We are unable to redirect orders once they are on their way to you.
  • Before we can ship your order, all orders are processed for fraud detection. We will do our best to keep delays to a minimum.
  • All items are quality controlled and checked for any faults before they are shipped to customers. Should you receive an item that is not in perfect condition, please contact us immediately.
  • Shipments outside of the CN may be subject to duty or import tax.
  • Tracking will be sent once your order has been shipped. The online tracking link may take up to an additional day to show the progress from the shipping courier.

INTERNATIONAL SHIPPING: WE ARE NOT RESPONSIBLE FOR LOST OR STOLEN MAIL FOR INTERNATIONAL ORDERS

  • Shipments outside of the CN may incur customs fees depending on the destination country.
  • You are responsible with ensuring to comply with laws and regulations of the country of destination. We does not have any responsibility on these additional charges that may apply.
  • Please note that certain countries may require certain documentation before the items are sent. If the necessary information is not provided, this may result in delays in the order.

If you have any shipping questions, please contact customer service at sale@minjion.com.