 |
|
|
|
|
 |
|
|
||
 |
|
|||
|
Order vitamins online! View our Schedule an appointment today! Order contact lenses online! What exactly is laser vision correction and are you a candidate? What are the 8 most common refractive eye problems? We carry
over 25 frame vendors including: Request a FREE brochure on any of our products! Revo sunglass collection FREE medication assistance! FREE School Screenings!
|
Commercial Aircraft: A study related to air quality The term dry eye is related to the pre-corneal tear film and the instability and or the lack of quality. There are many factors that increase discomfort related to dry eye. Some of these are due to age, health and environment. There are some ocular and systemic medications, as well as health conditions, that create or aggravate a dry eye condition. These health conditions are not limited to neurohormonal factors, allergies, rhinits, autoimmune disease and EpsteinBarr virus. Dry eyes are more prevalent in females; people wearing contact lenses, taking medications and maybe associated with allergies. Studies have been performed on the air quality on three types of commercial aircraft. The three aircraft tested were the Airbus 320, DC 9 and the Boeing 767. The source of ventilation in commercial aircraft is the engine-compressor bleed air. The air passes through heat exchangers and is cooled to the desired temperature. Half of the air in commercial aircraft is recycled, and the other half is from the bleed air. Since the 1980’s, the airline industry has attempted to save $30 million yearly by reducing energy costs through recycling air with inadequate ventilation. Studies over the years have been performed on 158 aircraft resulting in the findings of increased levels of carbon dioxide and low levels of humidity. Indoor pollution is composed from individuals (28%) and materials (72%). There are several factors that cause materials to emit pollution. These are the ventilation rate, surface air velocity, temperature and humidity. Some of the most volatile organic compounds are found on commercial aircraft; formaldehyde and ethyl alcohol are used in high concentrations in aircraft. Also the more people aboard an aircraft, the more carbon dioxide will be emitted. The Consumers Union found that the Boeing 757 had the worst indoor air quality and the Boeing 747 had the best. The levels of carbon dioxide were found to be the highest on takeoff and landing, rather than the level cruising. This is of concern for those patients that have heart conditions, as the decrease in oxygen occurs, increased stress is put on the heart as it tries to compensate. Levels of humidity dropped from 47% to 11% within thirty minutes of takeoff. The lower level of humidity increases water evaporation from soft contact lenses, resulting in ocular discomfort. It is recommended that patients with contact lenses not wear them while in flight. It is also noted that patients that have had LASIK or other types of refractive surgery, they should lubricate generously while in flight. In conclusion, the air quality was the worst on the Airbus 320, with the highest levels of carbon dioxide and lowest humidity. As the air quality becomes poor, intolerance of contact lenses and irritated eyes for LASIK patients occurs. A recommendation has been suggested to the airline industry that improvements need to be made in regards to improved ventilation.
Primary eye care | Contacts | Glasses | Order contacts online Laser corrective surgery | Keratoconus | Free articles & information Home | Office info | Appointment request form Contact us | Privacy practices Village Optical: In town
state-of-the-art eye care Site
Usage Conditions |
|
||
|
||||
