Browsing by Author "Dervisogulları, Mehmet Serdar"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Acute effects of exercise on choroidal thickness and ocular pulse amplitude
    (2019) Dervisogulları, Mehmet Serdar; Totan, Yuksel; Kulak, Ali Ender; Guler, Emre; 0000-0003-2006-2906; G-7851-2015
    Aim: To explore ocular changes in healthy people after exercise. Material and Method: Twenty participants underwent exercise for 15 minutes on a treadmill. Measurements of choroidal thickness, intraocular pressure (IOP), ocular pulse amplitude (OPA), and blood pressure were taken before and after exercise. Enhanced Depth, Imaging optical coherence tomography (EDI-OCT) was used to measure choroidal thickness at the fovea and at the areas 1500 mu m nasal and 1500 mu m temporal to the fovea; IOP and OPA were measured by the dynamic contour tonometer (DCT; Swiss Micro technology AG, Port, Switzerland). Blood pressure was measured concurrently with the acquisition of the scans. Results: Twenty participants (20 eyes) with a mean age of 22.65 +/- 0.98 years were measured. There was a significant increase in systolic and diastolic pressure after exercise (p<0.05). There was a significant decrease in IOP and OPA after exercise (p<0.05). There was no significant difference in the subfoveal, nasal or temporal choroidal thickness measurements after exercise (p>0.05). Discussion: In our study, there was no significant change in the thickness of the choroid after exercise. IOP and OPA significantly decreased, and systolic and diastolic blood pressure significantly increased, after exercise. This indicates an adaptation of vascular resistance due to vasoconstriction. The IOP and OPA decreases do not seem to be related with the changes in choroid thickness.
  • No Thumbnail Available
    Item
    Comparison of the intraocular pressure measurements with the tono-pen and the goldman applanation tonometer and the effect of central corneal thickness on measurements
    (2019) Dervisogulları, Mehmet Serdar; Akarsu, Cengiz; Ergin, Ahmet; 0000-0003-2006-2906; G-7851-2015
    Aim: Incorrect values of applanation tonometers according to varying corneal thickness were investigated many times. In this study, we aimed to compare intraocular pressure (IOP) measurements of the Tono-Pen and Goldman applanation tonometer (GAT) in eyes with normal corneas of various thicknesses. Material and Method: IOP was measured with Tono-Pen and GAT respectively in 255 patients' eyes with normal corneas. Only the right eyes were analyzed for statistical purposes. Central corneal thickness (CCT) was measured using an ultrasound pachymeter after all IOP determinations had been made. Results: With both instruments, IOP varied with CCT. Readings with Tono-Pen showed a mean increase in IOP with increasing CCT of 0,18 mmHg/10 mu m and an increase of 0,16 mmHg/10 mu m with the GAT. The Tono-Pen consistently recorded comparatively higher IOPs than the GAT (p < 0,05). Discussion: In our study, the difference between the Tono-Pen and GAT measurements is statistically insignificant and 60% of this difference is within the 1 mmHg range. Although it is thought that Tono-Pen may be less affected by corneal thickness due to the measurement from a smaller area we did not obtain data that Tono-Pen is less affected by corneal thickness as a result of linear regression analysis. The Tono-Pen is more affected by CCT when used to measure IOP in eyes with normal corneas. This is contrary to expectations, based on the theory that Tono-Pen is least affected by the CCT because it needs smaller applanation area.