People who use social networks, with permanent residence in Greece, aged above 18 years old and adequate literacy of Greek language

Participants are contacted through social networks (Facebook) which provide a link to website that contains the questionnaire. Then, they complete the questionnaire which consists of the following 2 parts:

1. participant's demographic characteristics with questions regarding age, visual acuity - refractive error, spectacles and contact lenses use, and compliance to mask-wearing directives.
2. 20 items that construct 5 subscales: a) near vision (5 items), b) distance vision (3 items), c) ocular discomfort (3 items), d) driving (2 items), e) limitations (3 items), need for help (2 items), work collaboration (1 item), and emotional impact (1 item).

The impact of spectacles on the compliance of Greek people to mask-wearing directives will be assessed via this questionnaire.

1. Gender
2. Age
3. Use of spectacles (a. no use, b. for distance, c. for near, d. for distance and near)
4. Use of contact lenses (a. no use, b. rarely, c. frequently, d. almost always)
5. Belonging to a vulnerable group (1. No, 2. Yes, 3. I don't know)
6. Binocular Distance Best Spectacle-Corrected Visual Acuity (if it is known) (1. I don't know, 2. <1/10, 3. 1-3/10, 4. 4-6/10, 5. 7-8/10, 6. 9-10/10)

Compliance to mask-wearing directives

1. Yes, always
2. Yes, almost always
3. Sometimes
4. No, almost never
5. No, never

Difficulty in near vision activities (reading a printed document in the workplace or in daily life, reading a document on computer in the workplace or in daily life, reading a message on mobile phone) when using a face mask

1. No difficulty
2. Little difficulty
3. Some difficulty
4. Great difficulty
5. I have stopped this activity because of my vision and the use of face mask
6. I need to remove my face mask

Difficulty in distance vision activities (recognizing people on the opposite sidewalk, reading road and shop signs, crossing roads) when using a face mask

1. No difficulty
2. Little difficulty
3. Some difficulty
4. Great difficulty
5. I have stopped this activity because of my vision and the use of face mask
6. I need to remove my face mask

Ocular discomfort (tearing sensation, stinging sensation, general discomfort) when using a face mask

5-point Likert scale (1 = I absolutely agree / 5 = I absolutely disagree)

Chi-squared test will be performed to assess if the compliance to mask-wearing directives is related to the use of spectacles