Wydanie 2/2005

Wpływ wybranych czynników fizycznych środowiska pracy na występowanie zaburzeń filmu łzowego u pracowników biurowych

Influence of Selected Physical Microclimate Parameters on the Tear Film Stability Changes Among Office Workers

Karolina Agopsowicz1, Jarosław Marek1, Krzysztof Dudek2, Rafał Spławski3

1Katedra i Klinika Okulistyki Akademii Medycznej we Wrocławiu
Kierownik: prof. dr hab. med. Maria Hanna Niżankowska
2Instytut Maszyn i Inżynierii Pomiarów Politechniki Wrocławskiej
Kierownik: prof. dr hab. inż. Eugeniusz Rusiński
3Katedra Klimatyzacji i Ciepłownictwa Politechniki Wrocławskiej
Kierownik: prof. dr hab. inż. Janusz Jeżowiecki

Summary: „Dry eye like” symptoms are commonly reported by VDU operators.
The purpose of this investigation was to determine whether a tear film stability changes with time had been modified by environmental conditions.
Methods: Precorneal tear film stability was assessed by non invasive methods, followed by (within a few days) Schirmer's test, FBUT, lissamine green staining. Blink rate was recorded by video camera system. Air parameters (temperature, humidity, velocity) were collected using TESTO, type 454. The microclimate parameters remained stable throughout the study period. Ocular temperature was assessed with a termographic camera (Thermovision 550). Lipid layer structure and tear film stability were assessed with the Keeler Tearscope. All measurements were carried out in the morning and after 6 hours of intensive, continuous office work.
Results: After long periods of intensive work in air conditioned rooms there were significant changes in the tear film stability: the lipid layer patterns assumed typically „office eye syndrome”. The temperature loss varied noticeably among VDU operators and reached in some cases 1.6°C loss in 7 sec. Subjects with low BUT tests had higher TVF values and slower blink rates, but were sometimes asymptomatic. The subjective dry eye symptoms tend to aggravate with decreased relative air humidity. However, in some cases we detect a noticeable adaptation process of the tear film, reaching a stable profile after 6 hours of work.
Conclusions: There was a noticeable change in tear film stability after several hours of intensive work in front of VDU. Type of air conditioning also plays a great role in causing „dry eye like” symptoms in VDU operators.