A red alert was issued for Wednesday, June 11, as extreme heatwaves hover over Delhi-NCR and states nearby. On Wednesday, the capital city's temperature shot up to 45.5 degrees, and marked the fifth consecutive time this month that the temperature crossed the 40-degree mark. The India Meteorological Department (IMD) issued a red alert for the national capital. As per the IMD's daily weather bulletin issued at 2 pm on Wednesday, "Heatwave conditions are likely to prevail at many places across Delhi-NCR."ALSO READ: Beat The Heat With ORS: How To Know Which One Is Real?Dr Naresh Kumar, a senior scientist at IMD also told PTI that severe heat wave is expected across northwest India, including Delhi, Punjab, Haryana and Rajasthan. This is expected to persist until June 12. However, from June 13 onwards, one can expect wester disturbance to bring partial relief from the light rain and thunderstorms. This situation will replace the red alert with an orange alert. Dr Kumar also noted that Uttar Pradesh, Himachal Pradesh, Madhya Pradesh, and Jammu & Kashmir will also remain under red alert for the next three days. The IMD data has predicted a slight dip in temperature after June 14. However, as of now, the IMD officials indicated that the temperature "feels like" 51.9. On Monday, the IMD noted that the temperature 'felt like' 49 degrees.The heatwave not just shoots up the temperature, but also brings health issues, one can feel nauseated, dizziness, or even experience severe dehydration. However, there are some steps one could take to prevent this from happening.READ MORE: Heatwave In India: Know How It Affects Different Parts Of Your Body Heatwaves Impact On EyesThe combination of heat and low humidity causes tears to evaporate faster, leading to dry eye syndrome. Symptoms include redness, itching, burning sensations, and a gritty feeling, as though something is stuck in the eye. Blurred vision and eye fatigue may also occur.More seriously, intense UV radiation from the sun can cause photokeratitis, or sunburn of the eye. This condition damages the cornea, resulting in pain, light sensitivity, and temporary vision loss. Over time, long-term UV exposure increases the risk of cataracts and macular degeneration, both of which can cause permanent vision problems.Ironically, trying to escape the heat can also backfire. Spending too much time in air-conditioned environments dries out the air, which further reduces moisture in the eyes, intensifying the symptoms of dry eyes.How It Impacts Rest Of Your BodyThe body maintains a stable core temperature—around 37°C—through internal mechanisms controlled by the hypothalamus. Under normal conditions, sweating helps the body release heat, but in hot and humid weather, sweat doesn’t evaporate efficiently, reducing the cooling effect.A 1985 NASA report noted that the body can only tolerate external temperatures above 35°C if humidity is low. When it fails to cool itself properly, the body begins to store excess heat—a condition known as hyperthermia.This begins with heat exhaustion, marked by dizziness, weakness, thirst, and nausea. A 2023 study by the University of Roehampton in the UK found that at 40°C and 25% humidity, metabolic rates jumped by 35%—even though the core body temperature remained stable, the body was clearly under stress.If untreated, heat exhaustion can progress to heatstroke, a potentially fatal condition where the body temperature exceeds 40°C. It puts enormous strain on the heart, kidneys, and brain, and requires immediate medical attention.CHECK THIS OUT: Foods You Should Avoid During Heat WaveWhat To Do To Prevent This From Happening?Wear UV-Protective SunglassesStay hydratedUse lubricating eye dropsAvoid direct sunlight Limit air conditioner exposure immediately after you enter from outsideAvoid highly spiced or processed foodsAvoid caffeinated and alcoholic beverages