Scorching summer: prescription sunglasses, polarized and photochromic lenses — how to choose correctly?
Suggestions for choosing prescription sunglasses this summer: polarized to reduce glare, photochromic for flexibility indoors and outdoors, scratch-resistant coating, and when to remeasure your prescription — Dien Bien Phu Eyewear 529 3/2 Street.
Optometrist Vũ Văn Tiệp
March 28, 2026
Summer in Ho Chi Minh City and the southern provinces often comes with scorching heat, high UV, and strong reflection from asphalt roads, car windows, water surfaces, or building glass roofs. People with myopia, hyperopia, or astigmatism who only wear non-prescription sunglasses will have to layer lenses, see blurry, or squint — both uncomfortable and increasing the risk of eye strain during long drives. The common solution is prescription sunglasses, combining suitable lens color and coating; some people choose photochromic lenses to use one pair both indoors and outdoors. This article helps you distinguish between polarized and photochromic, understand the limitations when driving in a cabin, maintain summer lenses, and know when to remeasure your prescription — it serves as general advice; the final decision should be after measuring and trying on glasses at stores like Dien Bien Phu Eyewear, 529 3/2 Street (contact).
Why is summer “harsh” on lenses?
High temperatures, sweat, dust, and sand (going to the beach, picnics) increase the risk of scratched coatings. Scratched lenses scatter light — they can withstand daytime, but sunset/headlights can easily cause halos and glare. Additionally, UV rays have long-term effects on eye tissue; prescription sunglasses still need lens material and darkness sufficient to reduce glare, not just “cosmetic color change.”
Prescription sunglasses: choosing lens base and refractive index
When making prescription sunglasses, you still need to decide on the refractive index (1.56, 1.60, 1.67…) just like indoor glasses — high myopia often wants thinner so that the sunglasses frame is not too thick at the edges. Tint colors (gray, brown, green, gradient…) affect darkness and contrast perception; it’s best to try outdoors or under bright lights similar to your usual environment. Read more about what high-index lenses are if you are considering 1.67 / 1.74.
Who benefits from polarized lenses, and who doesn't?
Polarized filters polarized light from reflective surfaces — very useful when driving during the day, going to the beach, fishing, or on sunny + wet roads. However, some people find phone screens / ATMs appear strangely dark or need to tilt their viewing angle — this is a phenomenon that can occur, not a lens cutting error. Compare closely with photochromic in polarized prescription or photochromic for daytime driving.
Prioritize polarized prescription when...
You drive long distances during the day, spend many hours in bright sunlight, or are sensitive to reflections from car windows / water surfaces. If your work requires looking at screens outdoors continuously, try polarized before finalizing.
Photochromic lenses: convenient but have “blind spots” in cars
Photochromic helps stay clear indoors, darken outdoors without changing pairs. In summer, outdoors is very bright, so you need to ask clearly about the changing speed and maximum darkness of each line. In cars, windshields block most UV — many lines change little or slowly in the cabin; if driving for many hours at noon, sometimes you still need separate prescription sunglasses. Details on pros and cons in photochromic lenses.
Scratch-resistant coating and lens cleaning under the sun
Cleaning glasses with a cotton cloth when the lenses still have sand is the quickest way to cause scratched coatings. It’s best to rinse with water or spray specialized solutions, wipe with a microfiber cloth. Store in a hard case when going to the beach — avoid rubbing against keys in your bag. When the lenses are heavily scratched, consider replacing lenses before night driving due to increased light scattering — related to night driving: lenses and coatings.
Children and the elderly under the sun
Children participating in outdoor activities in summer need wide-brimmed hats + suitable sunglasses (if they have prescription). Elderly individuals after cataract surgery or using light-sensitive medications need doctor's recommendations for the level of protection — do not self-select too dark a tint for activities requiring peripheral vision.
School myopia and summer sun: not just “prescription strength”
In summer, many children increase outdoor time — there is evidence that reasonable outdoor light may relate to visual health in the context of school myopia, but it does not mean abandoning glasses or self-reducing prescription strength. If parents are concerned about the mechanism, they can read more about what school myopia is and then consult a doctor for each child.
Prescription sunglasses and special situations
People with high astigmatism, significant myopia-hyperopia difference between two eyes, or needing intermediate vision (gym clock outdoors, airplane window) should clearly communicate with the technician to choose prescription strength, lens center, and frame curvature — sunglasses often have larger curves, incorrect PD can easily cause distortion more than flat frames. If you are both presbyopic and myopic, you may need tinted multifocal, separate reading, or two pairs instead of a simple single prescription; see multifocal lenses.
When to remeasure prescription for sunglasses?
If distant vision is no longer sharp even with the correct sunglasses, or if you feel eye strain after wearing them for a long time, your prescription may have changed. It is advisable to measure periodically (usually 12–24 months depending on age and recommendations), especially before a long trip or after changing many hours of close work. Refer to signs your eyes need to be measured for glasses.
Suggestions for choosing lens colors and outdoor activities
Neutral gray usually has little color distortion of the scenery; brown increases contrast in sunlight; green is easy to soothe when looking at trees for a long time. Gradient (dark on top, light below) may suit someone who both drives and looks at the dashboard — need to try to avoid glare in the lower viewing area. All choices must still accompany precision and not reduce safety when participating in traffic.
Checklist before finalizing prescription sunglasses
Try: looking far outside the store, looking at your phone, looking at the steering wheel (if driving). Ask: production time, lens warranty, whether PD is remeasured on the sunglasses frame. Remember: prescription sunglasses are not for night driving.
Conclusion
The scorching summer is the time to invest correctly in prescription sunglasses or quality photochromic lenses — both comfortable and safe when driving and engaging in outdoor activities. Polarized excels in reducing glare from reflections; photochromic excels in flexibility but needs to be tested in the car if you drive a lot. To choose genuine lenses and cutting schedules, see genuine lenses in District 10, how long it takes to cut lenses, articles, and lens selection.
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