IntacsÂ® Eye Surgery. The IntacsÂ® eye surgery procedure usually requires only a one hour office visit. A preoperative exam will determine if a patient is able to undergo IntacsÂ® eye surgery as a treatment for myopia or keratoconus.ntacsÂ® Eye Surgery. The IntacsÂ® eye surgery procedure usually requires only a one hour office visit. A preoperative exam will determine if a patient is able to undergo IntacsÂ® eye surgery as a treatment for myopia or keratoconus.
The Summer Factor: Temperature. Temperature also affects density altitude. When you heat the air, the air molecules have more energy. And, when they have more energy, they spread farther apart. (You probably learned this in high school chemistry class...). When the air is warmer than standard, it's less dense and performance decreases.
Therefore, the air pressure is lower. Air temperature changes as you go higher above the earth. Since the surface of the earth heats the air above it, the air is warmer near the ground. Air pressure on the earth's surface also changes. Changes in temperature cause changes in air pressure. As the air near the surface of the earth becomes warmer, the particles becomes warmer, the the particles of the air move farther apart. The air becomes lighter and rises. The lighter air pushes down on the surface of the earth with less pressure.