Abstract
In ophthalmology, the thermal effect of argon laser is the most widely used category of laser- tissue interaction. The rise in tissue temperature has to exceed a threshold value for photo coagulation of retinal blood vessels. This value mainly depends on the laser. The most suitable argon laser power P and exposure time (t) which would be more effective for thermal and electrical behaviour of chicken eye was studied. This was achieved by measuring the variations in ocular temperature in electroretinogram (ERG) records under the effect of argon experiment, while power density (P) and exposure time (t) were varied in four different ways for each dose (pt). Results indicated that for the same laser dose, the temperature distribution of the eye, using low power density and high exposure time was higher than that high power density and low exposure time, indicating non-linearity of the laser dose. This finding was confirmed by ERG records which showed similar variations in b-wave latency, amplitude and duration, for the laser exposure conditions. This indicates variations in retinal function due to laser-dependent temperature variations. 5 figs., 3 tabs.
El-Sayed, E M;
Talaat, M S;
Salem, E F
[1]
- Physics Department, Faculty of Science, Ain Shams University, Cairo (Egypt)
Citation Formats
El-Sayed, E M, Talaat, M S, and Salem, E F.
Non-linear behaviour of power density and exposure time of argon laser on ocular tissues.
Egypt: N. p.,
1996.
Web.
El-Sayed, E M, Talaat, M S, & Salem, E F.
Non-linear behaviour of power density and exposure time of argon laser on ocular tissues.
Egypt.
El-Sayed, E M, Talaat, M S, and Salem, E F.
1996.
"Non-linear behaviour of power density and exposure time of argon laser on ocular tissues."
Egypt.
@misc{etde_521055,
title = {Non-linear behaviour of power density and exposure time of argon laser on ocular tissues}
author = {El-Sayed, E M, Talaat, M S, and Salem, E F}
abstractNote = {In ophthalmology, the thermal effect of argon laser is the most widely used category of laser- tissue interaction. The rise in tissue temperature has to exceed a threshold value for photo coagulation of retinal blood vessels. This value mainly depends on the laser. The most suitable argon laser power P and exposure time (t) which would be more effective for thermal and electrical behaviour of chicken eye was studied. This was achieved by measuring the variations in ocular temperature in electroretinogram (ERG) records under the effect of argon experiment, while power density (P) and exposure time (t) were varied in four different ways for each dose (pt). Results indicated that for the same laser dose, the temperature distribution of the eye, using low power density and high exposure time was higher than that high power density and low exposure time, indicating non-linearity of the laser dose. This finding was confirmed by ERG records which showed similar variations in b-wave latency, amplitude and duration, for the laser exposure conditions. This indicates variations in retinal function due to laser-dependent temperature variations. 5 figs., 3 tabs.}
place = {Egypt}
year = {1996}
month = {Dec}
}
title = {Non-linear behaviour of power density and exposure time of argon laser on ocular tissues}
author = {El-Sayed, E M, Talaat, M S, and Salem, E F}
abstractNote = {In ophthalmology, the thermal effect of argon laser is the most widely used category of laser- tissue interaction. The rise in tissue temperature has to exceed a threshold value for photo coagulation of retinal blood vessels. This value mainly depends on the laser. The most suitable argon laser power P and exposure time (t) which would be more effective for thermal and electrical behaviour of chicken eye was studied. This was achieved by measuring the variations in ocular temperature in electroretinogram (ERG) records under the effect of argon experiment, while power density (P) and exposure time (t) were varied in four different ways for each dose (pt). Results indicated that for the same laser dose, the temperature distribution of the eye, using low power density and high exposure time was higher than that high power density and low exposure time, indicating non-linearity of the laser dose. This finding was confirmed by ERG records which showed similar variations in b-wave latency, amplitude and duration, for the laser exposure conditions. This indicates variations in retinal function due to laser-dependent temperature variations. 5 figs., 3 tabs.}
place = {Egypt}
year = {1996}
month = {Dec}
}