Prescriptions Help

How do I get a prescription for glasses?

To get a prescription, you have to have an eye exam with an Optometrist or an Ophthalmologist. Prescriptions are usually valid for a period of one or two years.

If you’ve had an exam and need to obtain a copy of your prescription, your eye care professional is required by law to provide you with a copy. This should include the doctors name and information, date of service and signature of the doctor.

Terms you might see on your prescription and what they mean

OD - Latin for right eye

OS - Latin for left eye

Sphere (SPH) - Strength of the lens in Diopters. Corrects Myopia (nearsightedness) and Hyperopia (farsightedness).

Cylinder (CYL) - An indicator of Astigmatism, also measured in Diopters. Can have a (+) or (-) value.

Plano - No spherical correction needed. In other words zero.

DS -  Diopter sphere. This means you do not have a correction for astigmatism. In other words zero.

Balance - A lens with no prescription but balanced to be similar in look and weight to the other lens for cosmetic purposes.

Axis - Indicates the placement in degrees of the power for astigmatic lens.

Add - The power in Diopters needed in addition to your regular prescription to see up close.

Prism - May be prescribed to treat binocular dysfunction such as strabismus. May also be induced unintentionally by incorrectly measuring pupillary distance.

Pupillary Distance or PD - The distance from the center of one pupil to the center of the other measured in millimeters. In the United States, most states consider this to be part of the prescription and are required to give when requested.

Single Vision - Corrective lenses for a specific distance. Can be for Distance, Intermediate, or Reading.

Progressive (PAL) - Corrective lenses that are designed to give clear vision for distance, intermediate, and near vision all in one lens. We currently do not offer this option.

Bifocal - Corrective lenses that are designed to give clear vision for distance and reading. They have a visible line in the middle of the lens giving two distinct viewing areas. We currently do not offer this option.

Myopia - Nearsightedness. The ability to see things up close, but have trouble seeing far away. Examples are not being able to read freeway signs or the board at school. If you are myopic your sphere power on your prescription will have a (-).  

Hyperopia - Farsightedness.  The ability to see things far away, but have trouble seeing up close. Examples are not being able to read small prints such as a newspaper or book. If you are hyperopic your sphere power on your prescription will have a (+).

Presbyopia - A vision condition resulting in the loss of ability to focus on near things. This is very common and usually starts around the age of 40. If you have an add power listed on your prescription you are presbyopic. This is when most people will switch from wearing single vision glasses to a progressive or multifocal.

Astigmatism - A vision condition in which blurred vision is caused by an irregular shaped cornea. Common symptoms of untreated astigmatism are headaches, strain, squint, and blurred vision. If you are astigmatic, you will have a value listed under the Cylinder or Cyl column of your prescription. This can be a (-) or (+) number.

Can you fill strong prescriptions?

We are currently offering single vision glasses with prescriptions ranging from

-10.00 to +5.00 sphere

-4.00 to + 4.00 cylinder

Can you fill prescriptions with prism corrections?

Yes, in most cases.

Can I order Bifocal or Progressive?

We do not currently offer bifocal or progressive.

Can I order prescription reading glasses?


Can I order non-prescription reading glasses?

Yes, you can order your favorite frames as reading glasses.  You can shop from the prescription link. After choosing your frame you will be prompted to select your lens.  Non-prescription reading glasses is an option and you will just select your desired power.

What if I have an astigmatism?

Most people have astigmatism. We offer lenses that correct for your astigmatism according to your prescription and up to a +/- 2.00 CYL.

Can I use my contact lens prescription to order glasses?

No, a contact lens prescription may look similar to a glasses prescription, but they are measured differently, and can not be used to order glasses.

What is Index 1.60 and 1.67?

1.6 is a high index lens that has great optical qualities. It is thin and light, and protects your eyes from UV light. This lens comes standard for prescription orders up to +/-4.00 sphere (SPH) and up to  +/-2.00 cylinder (CYL). Total power is considered here. 1.67 is a high index lens that is even thinner than the 1.60 and also protects from UV light for stronger prescriptions over +/-4.00 sphere (SPH) and +/- 2.00 cylinder (CYL) and up to +/-6.00 sphere.

Total power is considered here.

Do my glasses offer a warranty?

We offer a 1 year warranty against manufacturing defects.  This warranty does not cover improper use, neglect, abuse, accident or improper storage.

Are prescription glasses FSA/HSA eligible? Can I use my vision insurance?

We do not accept FSA/HSA cards as a form of payment and are not set up to accept vision insurance, however you can request an itemized PDF receipt that can be submitted for reimbursement.

How long will it take to get my order?

We strive to get your glasses to you within 14 business days of receiving your prescription and PD. Lab processing time typically takes 7-10 business days and then your glasses are shipped to you with your selected shipping method.  Once your order is on its way, you will receive an email letting you know that it has shipped and will include a tracking number.  This is sent AFTER the lab processing time. Business days refers to Monday through Friday and excludes national holidays or other holidays that DIFF is closed during the year. Please ask in advance if any holidays might impact the prompt delivery of your order. We'll do our best to guide you on a proper timeline or potential delays.

Due to high volumes, our normal processing time of 10-14 business days is extended to 17-21 business days. Please note that shipping carriers are also experiencing high volumes and delays in some areas.

I am an international customer (outside the US), do I have to pay extra taxes and/or customs?

Yes. Customers are responsible for import taxes, customs duties, and/or fees imposed by the destination country.