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Eyeglasses are frames holding prescription lenses that bend light before it reaches your eye, correcting how the eye focuses. Choosing the right pair means matching three things: an accurate prescription, a frame that fits your face and lens power, and lens options suited to how you use them. Target Optical, for example, sells eyeglasses, prescription sunglasses, and contact lenses, with prescription lenses available at 40% off and free shipping on all orders — useful context if you plan to buy online rather than in a store.

What eyeglasses actually do

A lens corrects vision by changing the angle at which light enters your eye so it lands on the retina instead of in front of or behind it. Your prescription describes exactly how much correction each eye needs. The frame's job is to hold those lenses in the right position relative to your pupils — if the frame sits too low, too far out, or tilts, even a correct prescription performs worse.

Reading your eyeglasses prescription

An eyeglasses prescription typically lists values per eye (OD = right, OS = left):

If CYL is blank or zero, you have little or no astigmatism. PD is sometimes omitted from a prescription written for in-store use but is required for online ordering, so ask for it if you plan to buy remotely.

Frames: style, material, and fit

Frame choice is partly taste and partly mechanics.

• Face shape is a styling guide, not a rule: angular frames often balance round faces, rounded frames soften square ones. The more practical test is width — the frame front should roughly match the widest part of your face, and your eyes should sit near the horizontal center of each lens.
• Material affects weight and durability. Acetate (plastic) allows more color and shape variety; metal and titanium frames tend to be lighter and thinner.
• Fit points to check: the frame shouldn't slide when you look down, shouldn't pinch at the temples or nose, and the lenses should sit close enough that your eyelashes don't brush them.

Lens options

• Single vision — one prescription power across the whole lens; the standard choice for most everyday wear.
• Bifocal — two zones with a visible line, for distance plus near vision.
• Progressive — the same idea without a line, with a gradual transition; there's usually an adaptation period.
• Coatings — anti-reflective reduces glare and reflections; scratch-resistant and UV protection are common additions.
• Tints and photochromic — colored lenses for light sensitivity or sunglasses use; photochromic darken in sunlight and clear indoors.

Higher prescriptions generally need thinner, higher-index lens materials to avoid thick edges, which is worth factoring into cost.

Measuring fit and adjusting for comfort

Fit is measured, not guessed. PD centers the lenses over your pupils; optical center height matters too, especially for progressives. If frames arrive uncomfortable, most opticians can adjust nose pads, temple arms, and frame tilt — small tweaks that fix sliding, pressure points, and lenses sitting too high or low.

A practical way to decide

Start with your prescription and PD, then pick a frame width that matches your face, then choose lens type based on how you use your glasses (all-day distance, reading, or both). If you're buying online, confirm the return and adjustment policy before ordering, since fit issues are the most common reason a pair doesn't work out.

The most important thing to get right when choosing sunglasses is UV protection: look for lenses that block 100% of UVA and UVB rays, since that is what protects your eyes from sun damage. After that, the right choice depends on how you will use them — driving, sports, or everyday wear — plus how the frames fit your face and whether you need a prescription. Target Optical, for example, sells prescription sunglasses alongside eyeglasses and contact lenses, and notes that prescription lenses are available with 40% off and free shipping on all orders. If you don't need vision correction, non-prescription sunglasses are still worth choosing on the same protection and fit criteria.

Start With UV Protection

UV protection is the one feature you should not compromise on. Sunglasses that block 100% of UVA and UVB rays reduce the amount of ultraviolet radiation reaching your eyes. Darker lenses are not automatically more protective — a dark tint without UV filtering can actually be worse, because your pupils dilate behind the dark lens and let in more unfiltered light. So check the label for a stated 100% UVA/UVB claim rather than judging by how dark the lens looks.

Match the Lens Type and Tint to Your Use

Different tints and lens types suit different activities. The table below maps common uses to the lens characteristics that tend to work well.

Polarized lenses are worth it when glare is the main problem — driving, fishing, boating, or skiing. They cut reflected light that bounces off flat surfaces. The trade-off: some polarized lenses can make LCD screens (car dashboards, phone displays) harder to read at certain angles, so try before you commit if that matters to you.

Get the Fit Right

Fit affects both comfort and how much light leaks in around the edges.

• Face shape: Generally, frames that contrast with your face shape tend to balance it — angular frames on round faces, rounder frames on angular faces. This is a style guideline, not a rule, so treat it as a starting point.
• Coverage: Larger lenses and wrap-style frames block more light from the sides and above, which helps for driving and outdoor sports.
• Comfort: The frame should sit without pinching the nose or pressing behind the ears, and should not slide when you look down. Nose pads and adjustable temples help here.
• Weight: Lighter frames are easier to wear for long periods, especially if you also wear them while active.

Decide Between Prescription and Non-Prescription

If you already wear glasses or contacts, prescription sunglasses let you see clearly without stacking sunglasses over your regular glasses. Target Optical offers prescription sunglasses as part of its sunglasses selection, and prescription lenses are available with 40% off. If you don't need correction, standard non-prescription sunglasses are the simpler and usually cheaper route. A middle option is fit-over or clip-on styles for people who want to keep using their existing prescription glasses.

Budget and Where to Buy

Price depends mainly on lens features (polarization, prescription, specialty tints) and frame material and brand. Decide which features you actually need before comparing prices, so you don't pay for extras you won't use. Buying online is an option — Target Optical sells sunglasses online and states free shipping on all orders, which removes shipping cost from the comparison. When buying online, check the return policy and whether the listing states the UV rating, since you can't try the fit in person.

A Quick Checklist Before You Buy

1. Confirm the lenses state 100% UVA/UVB protection.
2. Match the tint to your main activity (everyday, driving, or sport).
3. Choose polarized only if glare is your main concern.
4. Check the frame fits without pinching or sliding.
5. Decide prescription vs. non-prescription based on whether you need correction.
6. Compare total price including any lens upgrades, and confirm the return policy if buying online.

To buy contact lenses, you need a current, valid prescription — even if you plan to order online. That prescription must include the lens brand and specific measurements (base curve, diameter, and power), not just your glasses prescription. Once you have it, you can compare replacement schedules, materials, and total cost, then order from a retailer like Target Optical or elsewhere. The sections below cover what to confirm before you buy and how to compare your options.

Start With a Valid Contact Lens Prescription

A glasses prescription and a contact lens prescription are not interchangeable. Contact lenses sit directly on the eye, so they need their own fitting and their own set of numbers.

Before ordering, confirm your prescription includes:

• Power (sphere) — the same concept as your glasses prescription, but values can differ.
• Base curve (BC) — the curvature that determines how the lens sits on your eye.
• Diameter (DIA) — the overall width of the lens.
• Brand and lens name — prescriptions are typically written for a specific lens.
• Expiration date — contact lens prescriptions generally expire, so check the date before you order.

If any of these are missing, you don't have a complete contact lens prescription. Ordering lenses that weren't fitted to your eyes is the most common and most avoidable mistake in this category.

Compare Replacement Schedules

Replacement schedule is the single biggest driver of both cost and convenience. It determines how often you open a new pair, how much solution and storage you need, and how much you spend per year.

A lower price per lens doesn't always mean a lower annual cost. Daily disposables often cost more per lens but eliminate cleaning solution and storage case expenses, which can narrow the gap. Run the math on a full year, not a single box.

Understand Lens Materials

The material affects comfort, oxygen flow to the eye, and how the lens feels over a long day.

• Soft lenses — the most common type; comfortable immediately and available in the widest range of replacement schedules.
• Silicone hydrogel — a soft lens material that allows more oxygen through to the eye; often the default for daily and extended wear.
• Rigid gas permeable (RGP) — smaller, firmer lenses that can provide sharper vision for some prescriptions; they require an adaptation period and more careful handling.

Your eye care professional selects the material during fitting. If you want to switch materials, that generally requires a new fitting rather than a simple reorder.

Ordering Online: What to Check

Target Optical's site describes shopping for contact lenses alongside eyeglasses and prescription sunglasses, with prescription lenses available at a discount and free shipping on all orders. Those are the terms stated on the site — confirm current pricing, promotions, and shipping details at checkout, since offers can change.

When ordering from any online retailer, verify:

1. Prescription verification — most retailers contact your eye doctor to confirm your prescription. Have your doctor's contact information ready.
2. Return and exchange policy — unopened boxes are commonly returnable, but opened boxes usually are not. Read the policy before ordering a large quantity.
3. Order quantity — buying a year's supply can lower per-box cost but locks you in if your prescription changes.

Factor In Insurance and Promotions

Vision insurance often covers a portion of contact lens costs, sometimes as an allowance that you can apply either to glasses or to contacts — but typically not both. Check whether your plan:

• Covers contact lenses as a benefit, and at what allowance.
• Requires you to use a specific retailer or allows out-of-network reimbursement.
• Has a separate contact lens allowance from the frame allowance.

Promotions and discounts can reduce the out-of-pocket cost, but they usually can't be combined with insurance in the same way. Compare the net price under each path before deciding.

A Quick Pre-Order Checklist

• [ ] Contact lens prescription is current and includes brand, BC, DIA, and power.
• [ ] Replacement schedule matches how often you actually wear lenses.
• [ ] Material is appropriate for your comfort and oxygen needs.
• [ ] Return policy reviewed before buying in bulk.
• [ ] Insurance allowance and any promotion compared for the best net price.

If your prescription is expired or missing the fitting measurements, the next step is an eye exam and contact lens fitting — not an order. Everything else on this list you can confirm before you check out.

You can buy glasses online in five steps: get your prescription and pupillary distance (PD), pick a frame that matches your face and lens needs, choose lens add-ons, confirm insurance and return terms, then check the final total before paying. Target Optical, for example, lists prescription lenses at 40% off with free shipping on all orders, so the main work is on your side: accurate measurements, the right frame fit, and knowing what your insurance actually covers.

Step 1: Gather your prescription and PD before you shop

Online checkout will ask for two numbers that are not the same thing:

• Prescription — sphere (SPH), cylinder (CYL), axis, and sometimes prism, for each eye. You get this from an eye exam. In the US, an optometrist must give you a copy after the exam.
• PD (pupillary distance) — the distance in millimeters between your pupils. It tells the lab where to center the lenses. A wrong PD is the most common cause of "these glasses give me a headache."

If your prescription doesn't list PD, ask the optical shop where you had the exam to measure it, or use a virtual PD tool if the retailer offers one. Prescriptions also expire — typically one to two years — so check the date before you order.

Step 2: Choose a frame size and shape that fits

Frame measurements are printed on the inside of the temple arm as three numbers, like 52-18-145:

The fastest way to get this right: find a pair you already own and like, read those three numbers, and filter the online catalog by the same range. Face shape matters less than fit — a frame that's too narrow pinches, and one that's too wide slides down.

Most sites offer virtual try-on using your phone or webcam. Use it to judge width and shape, but treat it as a rough guide, not a measurement tool.

Step 3: Pick lens add-ons deliberately

The frame price is rarely the final price. Lens options stack up:

• Single vision vs. progressive — progressive lenses cost more and need an accurate PD and fitting height.
• Anti-reflective coating — reduces glare and reflections; usually worth it if you drive at night or work at a screen.
• Blue light filtering — marketed for screen use. Evidence for eye-strain relief is mixed, so treat it as a comfort preference, not a necessity.
• Photochromic (light-adapting) lenses — darken outdoors. Convenient, but they don't fully replace sunglasses in a car.
• High-index lenses — thinner and lighter for stronger prescriptions. If your SPH is above roughly ±3.00, this is usually worth considering.

Each add-on changes the total, so add them one at a time and watch the price update.

Step 4: Check insurance, HSA/FSA, and return policy

Before checkout, confirm three things:

1. Insurance — many vision plans let you use out-of-network benefits online. You typically pay upfront and submit a claim for reimbursement, or the retailer may file for you. Ask which applies.
2. HSA/FSA eligibility — prescription glasses and contact lenses are generally eligible medical expenses in the US. Keep your itemized receipt.
3. Returns and warranty — look for the return window, whether it covers prescription lenses (not just frames), and who pays return shipping. A 30-day return window is common; some retailers charge a restocking or lens fee.

Step 5: Verify shipping and the final total

Before you pay, check:

• Production + shipping time — prescription lenses usually add several days to the frame's ship time. If you need glasses by a date, order early.
• Final total — frame + lenses + coatings + tax + shipping. Target Optical states free shipping on all orders, but confirm this at checkout for your location.
• What's in the box — case, cloth, and whether adjustments at a local store are included.

Common mistakes to avoid

• Ordering without a current PD — the single biggest source of returns.
• Assuming the frame price is the total — lens add-ons often cost more than the frame.
• Skipping the return policy — prescription lenses are harder to return than frames.
• Ignoring prescription expiry — an expired Rx may be rejected at checkout.

If you have your prescription and PD in hand, buying glasses online is mostly a matter of matching frame measurements, choosing only the lens options you'll actually use, and confirming the return terms before you pay.