Dr Tony Holohan has urged people to wear face masks "correctly and safely" and instead of visors.
The Chief Medical Officer at the Department of Health said visors do not offer the same "benefits" as face masks, which give "far better protection".
He said it was particularly important for people in retail to wear masks and not visors.
He said: “The commitment to the spirit of the public health advice shown by people across Ireland since the onset of the Covid-19 pandemic is to be commended.
"This includes wearing a face mask where social distancing is difficult, in shops and on public transport.
"However, it is also vital that they are worn correctly and safely.
"Ensure you are fully covering both your mouth and nose with the face mask.
"Remember, visors do not offer the same benefits as face masks.
"I want to particularly highlight that it is very important that those who work in settings such as retail avoid the use of visors and instead use face masks.
"Face masks offer far better protection, and they should be worn by everyone who can wear them.
"Wearing one prevents someone who does not know they have Covid-19 from spreading it to another person.
"They are a key element of our defence against this virus, alongside staying at home and avoiding meeting people outside your household."
The top doctor's comments came as another 335 cases were confirmed around Ireland tonight.
Sadly, a further five people have died.
As of 2pm today 284 Covid-19 patients are hospitalised, of which 40 are in ICU.
There have been 23 additional hospitalisations in the past 24 hours.
Of the cases notified today;
- 155 are men / 177 are women
- 64% are under 45 years of age
- The median age is 37 years old
- 72 in Dublin, 41 in Donegal, 26 in Mayo, 25 in Cork, 23 in Kerry, and the remaining 148 cases are spread across 19 other counties.
There has been a total of 1,945 Covid-19 related deaths in Ireland.
There has now been 64,855 confirmed cases of Covid-19 in Ireland. Validation of data at the HPSC has resulted in the denotification of 18 confirmed cases. The figure of 64,855 confirmed cases reflects this.
The newest incidence rate table is below.
The COVID-19 Dashboard provides up-to-date information on the key indicators of COVID-19 in the community.
