scholarly journals Factors Affecting Measurements of IOP Using Non-Contact Eye Tonometer

2020 ◽  
Vol 70 (2) ◽  
pp. 133-140
Author(s):  
Rybář Jan ◽  
Hučko Branislav ◽  
Ďuriš Stanislav ◽  
Pavlásek Peter ◽  
Chytil Miroslav ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Objective Measurement ◽  
Artificial Cornea ◽  
Calibration Standard ◽  
Factors Affecting ◽  
Sources Of Error ◽  
Potential Sources

AbstractThe objective measurement of intraocular pressure (IOP) represents the identification of the symptoms of some diseases, e.g. glaucoma. This objective measurement can only be achieved by correct calibration of tonometers. Today, there is no uniform methodology for this calibration. Therefore, we introduce potential sources of error and try to quantify their contributions in this paper. Subsequently, a calibration standard containing an artificial cornea with similar properties to the human one should be designed.

Factors affecting changes in the intraocular pressure after phacoemulsification surgery

2020 ◽  
Vol 1 (3) ◽  
pp. 166-172
Author(s):  
Rita Dhamankar ◽  
◽  
Suhas S Haldipurkar ◽  
Tanvi Haldipurkar ◽  
Vijay Shetty ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Axial Length ◽  
Anterior Chamber Depth ◽  
The Other ◽  
Factors Affecting ◽  
Factors Associated ◽  
Post Surgery ◽  
Unit Increase ◽  
The Mean

AIM: To assess the changes in anterior chamber parameters and examine the factors associated with changes in the intraocular pressure (IOP) in individuals who have undergone phacoemulsification surgery. METHODS: It is a longitudinal analysis of secondary clinical data collected from 105 non-glaucomatous eyes (82 patients) undergoing a cataract surgery. We studied the association between anterior chamber parameters, grade of cataract, demographics, and changes in the IOP over a period of three weeks. We also evaluated the association between the pressure-depth (PD) ratio and changes in the IOP during this time. RESULTS: The mean age (SD) of the 82 patients was 60.1±7.8y. The mean±standard deviation (SD) IOP was 15.06±3.36 mm Hg pre-operatively; it increased to 15.75±4.21 mm Hg on day one (P=0.20). In the multifactorial models, the mean IOP was -1.715 (95%CI: -2.795, -0.636) mm Hg on day 21±5 compared with the pre-operative values. The anterior chamber depth (ACD), axial length, age, sex, and grade of cataract were not significantly associated with changes in the IOP. Each unit increase in the PD ratio was associated with an increase in the mean IOP by 1.289 mm Hg (95%CI: 0.906, 1.671). After adjusting for pre-operative PD ratio, none of the other variables (ACD, axial length, temporal angle) were significantly associated with changes in mean IOP. CONCLUSION: The PD ratio was the single most important factor associated with the changes in post-operative IOP over three weeks post-surgery.

scholarly journals POTENTIAL SOURCES OF ERROR IN CORONARY ARTERIOGRAPHY

1975 ◽  
Vol 124 (3) ◽  
pp. 386-393 ◽  
Author(s):  
DAVID C. LEVIN ◽  
HAROLD A. BALTAXE ◽  
THOMAS A. SOS
Keyword(s):  
Coronary Arteriography ◽  
Sources Of Error ◽  
Potential Sources

scholarly journals POTENTIAL SOURCES OF ERROR IN CORONARY ARTERIOGRAPHY

1975 ◽  
Vol 124 (3) ◽  
pp. 378-385 ◽  
Author(s):  
DAVID C. LEVIN ◽  
HAROLD A. BALTAXE ◽  
JACK G. LEE ◽  
THOMAS A. SOS
Keyword(s):  
Coronary Arteriography ◽  
Sources Of Error ◽  
Potential Sources

scholarly journals The Challenge Of Negation In Searches And Queries

2003 ◽  
Vol 7 (4) ◽  
pp. 63-76
Author(s):  
Valerie J. Harvey ◽  
Jeanne M. Baugh ◽  
Bruce A. Johnston ◽  
Constance M. Ruzich ◽  
Arthur J. Grant
Keyword(s):  
General Education ◽  
Sources Of Error ◽  
Potential Sources ◽  
Database Language ◽  
Practical Recommendations ◽  
Database Training

Negation poses certain challenges for queries and searches. This paper deals with exclusionary queries implemented using the ISO database language SQL and a dialog-based interface and with retrieval searches involving negation. This research arose because instructors in database courses noticed a large proportion of students making mistakes on certain queries. The paper explores underlying comprehension issues and makes practical recommendations on identifying potential sources of error and avoiding incorrect or misleading results. Proposed actions include changes in general education and database training and encouraging implementation of the new SQL:1999 standard.

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