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SPH, for Spherical, refers to the refractive correction in the prescription. Minus (-) are for nearsightedness, it means you have trouble seeing things faraway. and Plus (+) values are for farsightedness, it means you have trouble seeing near. If "PL" or "Plano" is written for either SPH value on your prescription, you should select a value of 0.00 or PL.
OD-SPH is a spherical correction for your right eye.
OS-SPH is a spherical correction for your left eye.
CYL (Cylinder)
CYL, for Cylinder, refers to the strength of the correction for astigmatism in the eye. It can be either positive or negative. If there is a CYL value on an eye, there must be an Axis value on that eye. If "DS" or "SPH" or "spherical" is noted in the CYL space on your prescription, you have no astigmatism in that eye. In that case, enter 0.00 or SPH/DS in the CYL and 180 in the Axis.
OD-CYL is a cylinder correction for your right eye.
OS-CYL is a cylinder correction for your left eye.
AXIS
Axis, refers to the angle of the correction for astigmatism in the eye (if one exists) from 1 to 180. If there is an Axis value on an eye, there must be a CYL (Cylinder) value on that eye. TThe Axis value is usually written as 3 digits, which means if your Axis value is 5, it is often written as 005. This Axis value is still 5, regardless of how it is displayed.
OD Axis is Axis correction for your right eye.
OS Axis is Axis correction for your left eye.
ADD (Addition)
This number indicates the additional magnification that is added to the distance prescription to get the reading portion of the lens in a multi-focal prescription. Sometimes seen on your prescription as "NV, ADD, Near, Reading, or Reading Addition. " "NV" stands for "Near-Vision." We display a single NV-ADD field since it is almost always the same value for both eyes.
PD
PD (pupillary distance) is the distance between your pupils in millimeter. Your PD is very important for accurately fitting your lenses to achieve vision acuity. In general, this number will be provided on your prescription after the eye exam; If not, you can also get it measured at home. All you need is a friend or a mirror and a ruler.
Prism is a measure in prism diopters, We can process prism prescriptions to correct eye orientation. The most common application for this is the treatment of strabismus. In eyeglasses, prisms are used primarily for double vision, positional correction, or convergence correction. By moving the image in front of the deviated eye, double vision can be avoided and comfortable binocular vision can be achieved.
A lens that includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.
SPH
SPH, for Spherical, refers to the refractive correction in the prescription. Minus (-) are for nearsightedness, it means you have trouble seeing things faraway. and Plus (+) values are for farsightedness, it means you have trouble seeing near. If "PL" or "Plano" is written for either SPH value on your prescription, you should select a value of 0.00 or PL.
OD-SPH is a spherical correction for your right eye.
OS-SPH is a spherical correction for your left eye.
CYL (Cylinder)
CYL, for Cylinder, refers to the strength of the correction for astigmatism in the eye. It can be either positive or negative. If there is a CYL value on an eye, there must be an Axis value on that eye. If "DS" or "SPH" or "spherical" is noted in the CYL space on your prescription, you have no astigmatism in that eye. In that case, enter 0.00 or SPH/DS in the CYL and 180 in the Axis.
OD-CYL is a cylinder correction for your right eye.
OS-CYL is a cylinder correction for your left eye.
AXIS
Axis, refers to the angle of the correction for astigmatism in the eye (if one exists) from 1 to 180. If there is an Axis value on an eye, there must be a CYL (Cylinder) value on that eye. TThe Axis value is usually written as 3 digits, which means if your Axis value is 5, it is often written as 005. This Axis value is still 5, regardless of how it is displayed.
OD Axis is Axis correction for your right eye.
OS Axis is Axis correction for your left eye.
ADD (Addition)
This number indicates the additional magnification that is added to the distance prescription to get the reading portion of the lens in a multi-focal prescription. Sometimes seen on your prescription as "NV, ADD, Near, Reading, or Reading Addition. " "NV" stands for "Near-Vision." We display a single NV-ADD field since it is almost always the same value for both eyes.
We see that you entered an unusual value for your prescription. This may not be processed normally, please confirm your entry.
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How to Measure Your Pupillary Distance(PD)?
Pupillary distance (PD) measures the distance between the centers of your pupils. This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible. The average adult's PD is between 54-74 mm. Your eye doctor will usually measure your PD during an eye exam. However, if it was not given to you, the below video will help you measure it yourself.
Printable PD ruler
Print this page on A4 (without scaling, at
100%. ) Use PD ruler at the bottom of the
page. Recommend to use a physical PD ruler
or consult your ophthalmologist.
Single vision, the most common lens type, features a single field of vision, or one prescription power throughout the entire lens. Single vision glasses can be prescribed for distance vision, near-vision, or reading glasses.
Progressive
Progressives are multifocal lenses with three viewing areas: distance, intermediate, and near vision. The top portion is used for distance-vision, the middle portion for mid-range vision, and the bottom portion for the near-vision or reading.
Bifocal
These offer a distinct separation between the distance and reading parts of your lenses.
Reading Glasses
"Reader" lenses have prescriptions starting with a plus ( + ) sign and are designed for those who have trouble focusing their eyes while reading. These lenses are designed to help correct farsightedness caused by hyperopia or presbyopia.
Leran How To Fill Out The Prescription
SPH(Sphere)
CYL (Cylinder) & AXI (Axis)
ADD(NV-ADD)
PD
2 PD Numbers
Prism
SPH(Sphere)
Minus (-) are for nearsightedness, it means you have trouble seeing things faraway. And plus (+) values are for farsightedness, it means you have trouble seeing near.
CYL (Cylinder) & AXI (Axis)
Refers to the lens power used to correct astigmatism. As with SPH, plus is for near‑vision astigmatism, minus for trouble seeing far away.
Axis – If an eyeglass prescription includes cylinder power, it also must include an axis value, which follows the CYL power. The axis indicates the angle (in degrees) between the two meridians of an astigmatic eye.
The axis is defined with a number from 1 to 180. If your AXIS is 005, it means you can choose 5 as your AXIS. If your AXIS is 076, it means you can choose 76 as your AXIS. The CYL and AXIS are used to correct an astigmatism. If you do not have an astigmatism, you will not have a CYL or AXIS included in your prescription.
ADD(NV-ADD)
The Near Vision (NV) Reading ADDition correction on a multifocal Rx. Can be used for bifocal or progressive glasses, or for single-vision reading or computer (intermediate) vision glasses.
There is no ADD for Single Vision prescription. Please choose Progressive prescription ( both for distance or near ) or Reading prescription ( just for reading ) if there is ADD value on your prescription.
PD
If you want to buy glasses looking far away or both far and near, like progressive and single vision glasses, you need to choose the distance PD. If you want to buy reading glasses, you need to choose the near PD.
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.
2 PD Numbers
If you want to buy glasses looking far away or both far and near, like progressive and single vision glasses, you need to choose the distance PD. If you want to buy reading glasses, you need to choose the near PD.
DUAL PD, or monocular PD, consists of two numbers and is the distance between the centers of each pupil to the bridge of the noseDual 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.
Prism
BD, BI, BO, BU: a prism correction on your Rx (may be indicated with Δ, and one of these four abbreviations. The B stands for base, and it could be base down (BD), base in (BI), base out (BO), or base up (BU).
Standard Lenses
Clear lenses are great for any occasion, whether it's general, day-to-day use, or for fashion.
Blue Light Blocking
Highly recommended for those using computers and other electronic devices daily to relieve eye fatigue. The blue-light blocking lenses can effectively block 400nm to 455nm harmful blue light from computers, phones, iPad, etc.
Photochromic Lenses
Clear indoor, darken when exposed to sunlight. May not darken inside a car or near windows since most windshields /windows block UV rays needed to darken the lenses
Driving Lenses
Eyeglass lenses for driving provide 100% UV blockage, comfortable anti-glare protection, sharper vision at night, and safer driving along with better color and contrast perception, helping remove glare off the road and car hood for a picture-perfect drive.
Color Tint
A lens tint is a permanent color in the lens used for either fashion or sunglasses. Tint brightness and density may appear slightly different on each computer screen and mobile device. Solid lens tint means the color and strength of the tint will be the same from the top to the bottom of the lens. The Gradient tint means the color is darker at the top and grades down to a lighter tone at the bottom of the lens.
Polarized Lenses
Polarized lenses definitely are your best company when enjoying your life outdoors, enhancing experiences of boating, skating, skiing mountain biking, and driving. Polarized lenses contain layers of special filters that will block intense reflected light and terminate the harmful glare from a horizontal orientation.
Mirrored Lenses
Mirrored lenses are sunglasses with a reflective optical coating (called a mirror coating or flash coating) on the outside of the lenses to make them appear like small mirrors. The mirror coating decreases the amount of light passing through the tinted lens, making it especially useful for conditions of sand, water, snow, and higher altitudes.