Heat and low humidity should predominate in the interior of SP Beatriz Jarins/g1 Relative air humidity could be below 30% this Saturday (1st) in the interior of São Paulo, warns the National Institute of Meteorology (Inmet), which could cause a health risk, especially in the regions of Presidente Prudente, Bauru, São José do Rio Preto, Itapetininga and Sorocaba. The statement was released this Friday (31) and reinforces that the situation could be more critical between 11 am and 10 pm this Saturday, a period in which humidity should vary between 30% and 20%; however, the institute describes a low risk of forest fires. ? Join the g1 Presidente Prudente e Região channel on WhatsApp The World Health Organization (WHO) establishes that rates below 60% are not suitable for human health. Given the situation, Inmet recommends residents: Drink plenty of fluids; Avoid physical wear and tear during the driest hours; Avoid exposure to the sun during the hottest hours of the day; Get more information from the Civil Defense (telephone 199) and the Fire Department (telephone 193). This Friday, the State Civil Defense released the temperature forecast for the weekend. See more below. According to the note, firm weather should predominate throughout the state of São Paulo; the action of a dry air mass favors stable conditions, with a predominance of sun between few clouds in most of São Paulo's territory. The next cold front is expected to reach the Presidente Prudente region from August 7th, with the possibility of rain and storms, as announced by the Center for Monitoring and Climate Studies and Weather Forecasting at the Universidade do Oeste Paulista (Unoeste Clima). See the videos that are trending on g1 Temperature forecast In Presidente Prudente, the weekend should remain hot, with temperatures between 16°C and 33°C, from Saturday (1st) to Tuesday (4th), according to Inmet. In addition to the presence of clouds in the sky throughout the day, health care must remain in place. There is also a forecast of firm and hot weather in Bauru for this weekend, with skies with few clouds between Saturday (1st) and Monday (3rd). Temperatures will vary between 14°C and 30°C over the next few days. In São José do Rio Preto, there is no rain forecast for the next few days, according to Inmet. The weather is expected to remain warm over the weekend. Temperatures vary between 16°C and 31°C, from Saturday (1st) to Tuesday (4th). In the Itapetininga region, the days should start colder, between 12°C and 16°C, but the heat prevails throughout the day, between 27°C and 29°C, from Saturday (1st) to Tuesday (4th). In Sorocaba, the weather should stabilize over the weekend. Temperatures vary between 12°C and 29°C in the same period. Health care Dry weather, low air humidity and higher concentrations of dust and mites, typical of winter, cause eye irritation and increase the desire to rub them. The apparently harmless habit can contribute to the development or worsening of keratoconus in predisposed people, warn experts consulted by g1. In addition to the temperature variation throughout the day, the frequent use of air conditioning and heaters further reduces the humidity in the environment, worsening dryness. This set of factors can increase eye irritation and lead many people to rub their eyes. The habit, which even provides momentary relief, can have consequences for vision health, especially in people predisposed to keratoconus. On g1, ophthalmologist Claudio Vieira, from Hospital dos Olhos Visare in Presidente Prudente and member of the Brazilian Council of Ophthalmology, describes how keratoconus affects the patient's routine. "The cornea normally has a rounded shape. In keratoconus, it thins and acquires a shape similar to a cone. The first symptoms are difficulty seeing, reduced vision, itchy eyes and difficulty driving at night", explains Claudio Vieira. The disease may have a genetic cause, however, it is not always developed in the carrier. "It is common in patients who have a family history, but the act of scratching, rubbing, squeezing the eye induces the formation of the cone", he warns. According to the ophthalmologist, more than 80% of patients with keratoconus have the habit of rubbing their eyes. "The cornea becomes more fragile and thinner, until it takes on the shape of a cone. That's why the disease gets its name", he continues. Professor of the Department of Ophthalmology at the Hospital de Clínicas (HC) of the State University of Campinas (Unicamp), Paulo Eduardo Casarin states that temperature changes and typical winter conditions favor the appearance or worsening of various eye diseases. "Climate changes alone do not cause diseases, but they create environmental conditions that favor the appearance or worsening of various eye conditions. This combination modifies both the ocular surface and favors the transmission of infectious diseases", he warns. According to the expert, among the factors that contribute to this scenario are: Drier air and prolonged low humidity; Lower temperatures and greater thermal amplitude; Use of heaters and air conditioning devices; Greater exposure to cold wind; Alternation between cold periods and hot, dry days; Increase in suspended pollutant particles; Greater concentration of smoke; Staying longer indoors; Greater circulation of respiratory viruses. "Sudden temperature changes alter the stability of the tear film, which is an invisible film that covers and protects the ocular surface. This factor leads to increased tear evaporation and obstruction of the eyelid glands. Consequently, it generates inflammation", explains Paulo Eduardo Casarin.