Taking care of your vision is one of the most valuable health investments you can make. Whether you’re scheduling a routine eye test or purchasing a new pair of prescription glasses, understanding the process helps ease concerns and improve outcomes. In this article, we explore the most common questions about eye tests and glasses. Each response is designed to provide clarity, covering everything from exam preparation to how long it takes to receive your new lenses.

What to Expect During Your Eye Test

How Long Does an Eye Test Take? Complete Timeline Explained

An eye test generally takes between 20 and 40 minutes, depending on the patient’s specific needs and whether additional diagnostics are required. The process begins with reviewing your medical history and any current vision problems. You’ll then undergo a series of vision assessments—reading charts, eye movement tracking, peripheral vision evaluation, and refraction tests to determine your prescription. Some clinics may include intraocular pressure testing and digital retinal imaging to screen for diseases like glaucoma or macular degeneration. If dilation is needed, expect the test to extend by 15 to 20 minutes to allow the drops to take effect and for your eyes to adjust.

Do I Need to Prepare Anything Before My Eye Test?

While eye tests don’t usually require special preparation, there are a few simple steps you can take to make the process smoother. Bring your current glasses or contact lenses, a list of medications, and notes about any eye symptoms you’ve experienced. Also, provide information on your family history of eye conditions like glaucoma, cataracts, or diabetes-related complications. Avoid wearing heavy eye makeup, especially mascara or eyeliner, which could interfere with the accuracy of certain exams. Being rested and alert will also help your eyes perform optimally during the testing process.

Can I Drive After an Eye Examination? Pupil Dilation Explained

You can typically drive after an eye exam unless your pupils are dilated. Pupil dilation involves applying drops that temporarily enlarge your pupils to allow a better view of the retina and optic nerve. After dilation, your eyes may be more sensitive to light, and your vision may become blurry for 4 to 6 hours. If you’re scheduled for this procedure, bring sunglasses to reduce glare and consider arranging alternate transportation. It’s always wise to check with your optometrist before the exam so you can plan accordingly.

Eye Testing Frequency and Diagnostic Clarity

How Often Should Adults vs Children Have Eye Tests?

Eye test frequency varies by age and health. For children, the first comprehensive eye exam should occur at six months of age, followed by another at age three and then annually once they start school. This ensures early detection of conditions like lazy eye or strabismus. Adults aged 18 to 60 without known issues should have an eye exam every two years. For adults over 60, yearly exams are advised to monitor for age-related changes. People with chronic health conditions, such as diabetes or hypertension, should also schedule annual visits regardless of age to monitor for complications.

What’s the Difference Between an Eye Test and Eye Exam?

Though used interchangeably, “eye test” and “eye exam” can mean different things depending on context. An eye test usually refers to a basic screening, often conducted at schools or optical retail stores. These tests assess visual acuity but may not check for underlying issues. An eye exam, however, is a comprehensive evaluation performed by an optometrist or ophthalmologist. It not only measures how well you see but also examines the internal and external health of your eyes, screening for diseases, abnormalities, and overall ocular function. When in doubt, opt for a full eye exam to ensure complete care.

Can I Get an Eye Test if I Don’t Have Symptoms?

Yes, and you should. Many eye diseases, such as glaucoma, macular degeneration, and diabetic retinopathy, begin with no visible symptoms. Regular eye exams are essential for early detection and can prevent irreversible vision loss. Just like you wouldn’t wait for tooth pain to visit a dentist, you shouldn’t wait for blurred vision to see an optometrist. Preventive care helps identify changes in eye pressure, retinal health, or refractive errors before they become more serious. Even if your eyesight seems stable, it’s crucial to have routine checkups to stay ahead of potential problems.

Getting Your Prescription Glasses

How Long Do Prescription Glasses Take to Make?

The turnaround time for prescription glasses usually ranges from 7 to 14 business days, though some basic prescriptions may be ready within a few hours in optical stores with in-house labs. The total wait depends on several factors, including the complexity of your prescription, availability of your chosen frames, and special lens treatments like anti-reflective coating, blue light blocking, or progressive multifocal designs. During peak seasons, such as back-to-school periods or year-end medical aid usage, delays can occur. Your optician should give you an estimated delivery date when you place your order.

Why Are My New Glasses Giving Me Headaches?

Headaches or discomfort from new glasses are often part of the adjustment period, especially if there’s a significant change in prescription or if you’ve switched lens types. It usually takes a few days to a week for your eyes and brain to adapt. Improper frame alignment, incorrect interpupillary distance (PD), or prescription inaccuracies can also contribute to discomfort. If your symptoms persist beyond 10 days, return to your optometrist for a reassessment. Adjustments to frame fit or lens centering can make a significant difference in comfort and clarity.

Can I Use My Old Prescription to Buy New Glasses?

Technically, yes—you can use an old prescription if it’s still valid, but it’s not ideal. Prescriptions typically expire after one or two years, depending on your country’s regulations. Vision can change subtly over time, and an outdated prescription may not reflect your current needs. Using an old script may result in discomfort, suboptimal vision, or even eye strain. An updated eye exam not only ensures you get the most accurate lenses but also includes a health check of your eyes to rule out issues that could affect your vision long-term.

What Do the Numbers on My Prescription Mean?

Your glasses prescription includes several technical components. The Sphere (SPH) number indicates whether you’re nearsighted (negative number) or farsighted (positive number). The Cylinder (CYL) and Axis values are used to correct astigmatism, a condition where the eye isn’t perfectly spherical. An Add number may be included for bifocal or multifocal lenses to indicate the strength required for reading. Prism values, if present, address eye alignment issues. Your optometrist can explain each component and what it means for your vision. Understanding your prescription helps you feel more confident in choosing lenses and frames.

How Do I Know if My Prescription Has Changed?

Your prescription may need updating if you experience blurry vision, squinting, double vision, headaches, or frequent eye fatigue. If reading or viewing screens becomes more difficult, or if you notice you’re holding items at unusual distances, it’s time for a reassessment. Even subtle changes in eyesight can affect your focus and comfort. Optometrists use objective measurements and patient feedback during exams to ensure accuracy. Regular check-ins every one to two years help track these shifts and keep your prescription up to date. Don’t wait until the symptoms interfere with daily tasks—early adjustments lead to better results.

Can I Get Glasses Without a Recent Eye Test?

Most optical providers require a prescription that’s been issued within the last 12 to 24 months. This policy protects both the patient and provider by ensuring the lenses prescribed are safe, accurate, and suited to the individual’s current needs. Buying glasses with an outdated prescription can lead to headaches, eye strain, and ineffective vision correction. If you haven’t had a test recently, many optical shops offer quick booking services or in-store testing. Always prioritize accuracy and eye health over convenience when it comes to choosing corrective eyewear.

Taking Control of Your Vision: Final Thoughts on Eye Tests and Glasses

When it comes to your vision, clarity matters—both in what you see and what you understand. Knowing how long an eye test takes, how often you should have one, and what your prescription means gives you more control over your eye health. From understanding pupil dilation to recognizing when your prescription needs an update, the answers to these most common questions ensure you’re making informed decisions every step of the way.

Whether you’re getting your first pair of glasses or updating your current prescription, your optometrist is your partner in maintaining lifelong vision wellness. Stay proactive, ask questions, and don’t wait for symptoms to appear. Your eyes are worth it.