General Eye Care, Pterygium

Ultraviolet (UV) light from the sun damages the eyes the same way it damages skin. On the Central Coast, coastal glare and high-elevation vineyard terrain raise UV exposure above what most residents expect from a mild coastal climate. Unprotected UV exposure speeds up cataract formation, causes pterygium (a growth on the eye’s surface), and can burn the cornea after just a few hours outdoors. Wearing UV400-rated sunglasses every time you go outside — even on cloudy days — is the most effective way to protect your eyes. 

Quick Takeaways 

  • What it is: UV eye damage happens when invisible ultraviolet rays harm the cornea and lens over time or all at once. 
  • Key symptoms: Redness, gritty pain, light sensitivity, blurred vision, or a visible growth on the white of the eye. 
  • Urgency level: Sudden eye pain after sun exposure needs same-day care; gradual changes need a routine comprehensive eye exam. 
  • Treatment approach: UV400 sunglasses prevent most damage; existing pterygium or cataracts may need in-office or surgical treatment. 
  • When to schedule: Anyone who farms, surfs, or drives frequently outdoors on the Central Coast should have annual eye screening. 
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What causes UV eye damage on the Central Coast? 

The cornea and lens absorb most UV radiation the eye takes in, so chronic exposure damages the proteins in the eye’s natural lens — the main driver of cataracts (clouding of the lens that blurs vision). UV exposure also damages the conjunctiva, the clear tissue over the white of the eye, which can lead to pterygium, sometimes called “surfer’s eye.” 

At ADV Vision, patients in San Luis Obispo, Paso Robles, and Santa Maria often ask why this matters here specifically. Coastal water reflects UV rays directly upward, and vineyard and ranch elevation around Paso Robles increases UV intensity further. The American Academy of Ophthalmology (AAO) confirms cumulative UV exposure is a leading modifiable risk factor for cataracts and related eye conditions.

What are the signs of UV eye damage? 

Photokeratitis, or “sunburn of the eye,” causes pain, redness, tearing, and a gritty sensation within hours of intense unprotected sun exposure. Vision usually returns within 24 to 48 hours as the eye heals. Long-term damage looks different: cataracts cause gradually blurred vision and increased glare, while pterygium appears as a visible pink growth on the white of the eye, usually starting near the nose. 

When should you see an eye doctor? 

See an eye doctor immediately for sudden eye pain, light sensitivity, or vision loss after sun exposure. Schedule a comprehensive eye exam if you notice a growth on your eye’s surface, worsening night glare, or gradual blurring. Left untreated, pterygium can distort the cornea, and cataracts continue clouding the lens until they interfere with daily activities like driving. 

If you spend time outdoors in San Luis Obispo, Paso Robles, or Santa Maria and haven’t had your eyes checked for UV-related changes, the team at ADV Vision offers comprehensive eye exams and treatment for pterygium and cataracts at all three locations. Schedule an appointment at ADV Vision or call (805) 987-5300. 

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How is UV eye damage diagnosed and treated? 

An ophthalmologist diagnoses UV-related damage through a comprehensive eye exam using a slit lamp, which magnifies the cornea and lens to catch early cataract formation or pterygium before symptoms become severe. Patients from vineyard and ranch communities around Paso Robles frequently come in with early pterygium they assumed was simple irritation — catching it early often avoids the need for surgery altogether. 

Mild damage often responds to non-surgical care: photokeratitis heals with lubricating drops and time away from bright light, and small pterygium can be managed with drops and consistent UV protection. When a pterygium grows large enough to affect vision, pterygium removal surgery at ADV Vision removes the growth. When UV-related cataracts interfere with daily vision, cataract surgery at ADV Vision replaces the clouded lens with a clear artificial one, including Light Adjustable Lens options evaluated during your exam. 

How can you protect your eyes from Central Coast sun? 

The National Eye Institute (NEI) recommends sunglasses that block 100% of UVA and UVB rays, labeled UV400, for anyone spending time outdoors. 

  • Wear wraparound UV400 sunglasses near the coast, where water reflects UV rays upward into the eyes. 
  • Add a wide-brimmed hat when working in vineyards or at elevation around Paso Robles. 
  • Protect children’s eyes early, since their eyes let more UV light through than adult eyes. 
  • Wear UV protection even on overcast days — up to 80% of UV rays pass through cloud cover. 
  • Schedule an annual comprehensive eye exam to catch early changes before they affect vision. 

Frequently Asked Questions About UV Protection and Eye Health 

Short-term UV damage like photokeratitis heals on its own within 24 to 48 hours. Long-term damage such as cataracts does not reverse on its own, but cataract surgery removes the clouded lens and replaces it with a clear artificial one to restore vision.

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Yes. Up to 80% of UV rays pass through clouds and fog, which are common during the Central Coast morning marine layer. UV400 sunglasses should be worn any time you’re outdoors during daylight hours, regardless of visible sunshine.

A pterygium is a fleshy growth on the white of the eye caused by long-term UV and wind exposure. It is not cancerous, but it can grow large enough to distort the cornea and affect vision if left untreated, which is why early evaluation matters.

Only if they are labeled UV400 or state they block 100% of UVA and UVB rays. Dark-tinted lenses without UV protection can actually increase UV exposure by causing the pupil to widen, letting more unfiltered UV light into the eye. 

Reviewed by the clinical team at ADV Vision. Last reviewed: July 2026. The information in this article is for educational purposes only and does not substitute for a comprehensive eye examination by a qualified eye care professional. 

UV exposure adds up year after year, and the Central Coast’s coastal glare and elevated vineyard terrain make consistent eye protection especially important. If you live or work in San Luis Obispo, Paso Robles, or Santa Maria, the team at ADV Vision offers comprehensive eye exams, pterygium evaluation, and cataract care to help protect your long-term vision. Schedule an appointment at ADV Vision or call (805) 987-5300.