When purchasing sunglasses, many people prioritize fashion or comfort. However, experts warn that eye safety should be the foremost concern. Prolonged exposure to ultraviolet (UV) rays can lead to serious eye problems, including cataracts, macular degeneration, and even a painful condition called photokeratitis, or “sunburn of the eye.” Because of these risks, selecting sunglasses with proper UV protection is essential.
One common misconception is that darker lenses automatically block more UV rays. In fact, lens color and darkness have little to do with UV protection. A pair of stylish, dark sunglasses without the appropriate coating can be dangerous because the darkness causes pupils to dilate, allowing more harmful rays to enter the eyes. To keep your eyes safe, sunglasses should block 99 to 100 percent of both UVA (ultraviolet A) and UVB (ultraviolet B) rays, which is usually marked on the label as UV 400.
Another concern is glare, which can reduce visibility and increase the risk of accidents, especially while driving. Polarized lenses are helpful because they cut glare from reflective surfaces like water, snow, or car hoods. Still, polarization is not the same as UV protection, so consumers should look for sunglasses that offer both features.
Photo: AdobeStock I 照片： AdobeStock
With the premise of safety in mind, the color of the lens deserves attention. When you walk into a store, you may be surprised by how many colors are available. These tints are not just about fashion; each serves a different purpose, helping improve vision and giving comfort under different lighting conditions. More importantly, the right lens tint can reduce risks and help drivers, cyclists, and athletes quickly adapt to changing environments.
許多人購買太陽眼鏡時，會優先考慮時尚或舒適感。然而專家警告，眼睛安全才應該是首要考量。長時間暴露在紫外線下可能會導致嚴重的眼睛問題，包括白內障、黃斑部病變，甚至會引發被稱為「光角膜炎（或「眼睛晒傷」）」的痛苦病症。由於有這些風險，挑選具備適當防紫外線功能的太陽眼鏡非常重要。
一個常見的誤解是：顏色較深的鏡片能自動擋掉較多的紫外線。事實上，鏡片的顏色與深淺和防紫外線功能幾乎沒有關係。一副時尚卻缺乏適當防護塗層的深色太陽眼鏡可能反而危險，因為深色會讓瞳孔擴張，使更多有害光線進入眼睛。為了確保眼睛安全，太陽眼鏡應該要能阻擋 99% 至 100% 的長波紫外線與中波紫外線，通常會標示為 UV 400。
另一個擔憂是眩光，它會降低視線清晰度並增加事故風險，尤其是在駕駛時。偏光鏡片會有幫助，因為它能減少來自水、雪地或汽車引擎蓋等反射表面產生的眩光。儘管如此，偏光功能與防紫外線功能不同，因此消費者應尋找有這兩項功能的太陽眼鏡。
在確保安全的前提下，鏡片顏色也值得留意。當你走進商店時，可能會對鏡片顏色如此多樣的選擇感到訝異。這些色調不只是時尚；每種顏色都有不同的功能，在不同光線環境下有助於改善視覺效果並提升舒適度。更重要的是，選對鏡片顏色能降低風險，幫助駕駛人、單車騎士與運動員快速適應環境變化。
（在嚴謹文法中，前後子句的主詞若不一致，when / while 引導的副詞子句不能化簡為分詞句構。但在現代用法中，這種主詞不一致的化簡有越來越常見的趨勢，這種情形通常發生在從上下文明確可判斷 when / while 子句的主詞是什麼的狀況下。）
Words in Use
1. purchase vt. 購買
Daniel purchased a new laptop for his work project.
丹尼爾為了工作專案而買了一臺新筆電。
2. prioritize vt. 優先考慮
Kevin prioritized his health by exercising regularly.
凱文透過規律運動把健康放在首位。
3. prolonged a. 持續很久的
After prolonged discussions, the team finally reached an agreement.
經過長時間的討論後，團隊終於達成共識。
4. exposure n. 暴露；接觸
Long-term sun exposure can lead to skin damage.
長期暴露在太陽下會導致皮膚受損。
5. automatically adv. 自動地
The lights automatically turn on when someone enters the room.
當有人進入房間時，燈會自動亮起。
Practical Phrases
1. have little to do with. . . 和……幾乎無關
The movie’s success had little to do with marketing and everything to do with word of mouth.
這部電影的成功幾乎與行銷無關，而全靠口碑。
2. serve a(n) + Adj. + purpose 起……的作用
Emma’s story served a useful purpose in teaching children about honesty.
艾瑪的故事在教育孩子誠實這件事上發揮了有效的作用。
3. adapt to. . . 適應……
adapt vi. 適應
Plants in the desert have adapted to extreme heat by storing water in their bodies.
沙漠中的植物透過在體內儲水來適應極端高溫。
聽文章朗讀及講解: https://ivy.pse.is/455bfu
本文出自常春藤解析英語雜誌: www.ivy.com.tw
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