Which of the following is the worst for eyesight during a sunny day?

wearing sunglasses with UV filter
wearing sunglasses without UV filter
not wearing sunglasses at all
wearing sunglasses inside buildings
Wearing sunglasses without UV filter causes the pupils to dilate and eyes to absorb more UV rays than they normally would without the sunglasses. Hence, it's much better not to wear sunglasses at all, than to wear ones without UV filter.
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Answers by country

wearing sunglasses with UV filter
wearing sunglasses without UV filter
not wearing sunglasses at all
wearing sunglasses inside buildings
answers
flagPakistan
5%
80%
12%
2%
40
flagItaly
8%
75%
16%
0%
12
flagGermany
0%
66%
29%
3%
81
flagAustralia
0%
59%
35%
5%
37
flagRepublic of Ireland
0%
57%
31%
11%
35
flagthe Netherlands
7%
53%
15%
23%
13
flagGreece
16%
50%
33%
0%
12
flagCanada
0%
50%
30%
10%
10
flagNigeria
38%
46%
15%
0%
13
flagPoland
3%
45%
36%
13%
12626
flagthe United Kingdom
5%
43%
43%
7%
111
flagthe Philippines
23%
38%
23%
15%
13
flagIndia
11%
33%
34%
18%
169
flagthe United States
6%
32%
49%
9%
166
flagEgypt
16%
25%
33%
16%
12