Comparison of Two Different Pupillometer
Study Details
Study Description
Brief Summary
Pupil diameter is a parameter of great interest in understanding brain systems and modern refractive surgery. Pupillometry, the measurement of variations in pupil dilation, has offered encouraging evidence for the involvement of disturbed reactivity in depression risk, according to studies. Traditional vision screening methods in children can be difficult due to poor cooperation and labour-intensive procedure, and therefore, a handheld photorefractometer offers reduced assessment time in detecting refractive errors. 2WIN uses infrared light, the patient is not aware of the several, rotating photoscreen images being exposed to afford multiaxial estimation of spherical and astigmatic refractive error.The purpose of this prospective study was to compare 2WIN and OPD Scan III pupillometers.
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Detailed Description
Pupil diameter is a parameter of great interest in understanding brain systems and modern refractive surgery. Pupillometry, the measurement of variations in pupil dilation, has offered encouraging evidence for the involvement of disturbed reactivity in depression risk, according to studies. According to research, the pupil dilates in reaction to stimuli requiring a larger cognitive load or a greater emotional intensity. Importantly, studies have related pupil size variations to brain activity in regions associated with emotion regulation, including the dorsolateral prefrontal cortex (DPFC) and the agenesis of the corpus callosum (ACC) . Thus, pupillometry is proposed as a viable peripheral gauge for a variety of brain systems involved in the processing of emotional information.
Some of the postoperative complaints of patients having refractive corneal or lens surgery are related to visual quality and are associated with large pupils since optical aberrations become more dominant when the pupil dilates . If the pupil size exceeds the optical zone size, a marked increase in higher-order aberrations could be observed. Patients might complain about poor contrast sensitivity, increased glare disability, or halos. Precise measurement of pupil diameter has therefore become an essential step in the preoperative evaluation of patients suitable for refractive surgery and is an important inclusion or exclusion criterion.
The purpose of this study is to assess the consistency of pupil diameter measurements between the two machines.
Study Design
Outcome Measures
Primary Outcome Measures
- Pupil size [1 day]
Photopic and mesopic pupil size will be measured using 2WIN photoscreening with OPD Scan III.
Secondary Outcome Measures
- Refractive Accuracy [1 day]
Refractive measurements using 2WIN photoscreening with Nidek ARK-1 Autorefractor.
Eligibility Criteria
Criteria
Inclusion Criteria:
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18 years old
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signed informed consent
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willing to participate in the study
Exclusion Criteria:
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abnormalities of the pupil (e.g., synechia, ectopia)
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corneal scars
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irregular astigmatism
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strabismus
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acute or chronic uveitis
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any kind of previous eye surgery
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medication that could have an influence on pupil reaction or size
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | He Eye Hospital | Shenyang | Liaoning | China | 110001 |
Sponsors and Collaborators
- He Eye Hospital
Investigators
- Study Chair: Emmanuel E Pazo, MD, PhD, He Eye Hospital, Shenyang, China
Study Documents (Full-Text)
None provided.More Information
Publications
- Critchley HD, Tang J, Glaser D, Butterworth B, Dolan RJ. Anterior cingulate activity during error and autonomic response. Neuroimage. 2005 Oct 1;27(4):885-95. doi: 10.1016/j.neuroimage.2005.05.047.
- Fardell J. Poverty and infant deaths. Nurs Times. 1989 Jan 11-17;85(2):18. No abstract available.
- Jones NP, Siegle GJ, Mandell D. Motivational and emotional influences on cognitive control in depression: A pupillometry study. Cogn Affect Behav Neurosci. 2015 Jun;15(2):263-75. doi: 10.3758/s13415-014-0323-6.
- Martinez CE, Applegate RA, Klyce SD, McDonald MB, Medina JP, Howland HC. Effect of pupillary dilation on corneal optical aberrations after photorefractive keratectomy. Arch Ophthalmol. 1998 Aug;116(8):1053-62. doi: 10.1001/archopht.116.8.1053.
- Rosen ES, Gore CL, Taylor D, Chitkara D, Howes F, Kowalewski E. Use of a digital infrared pupillometer to assess patient suitability for refractive surgery. J Cataract Refract Surg. 2002 Aug;28(8):1433-8. doi: 10.1016/s0886-3350(01)01350-5.
- Siegle GJ, Granholm E, Ingram RE, Matt GE. Pupillary and reaction time measures of sustained processing of negative information in depression. Biol Psychiatry. 2001 Apr 1;49(7):624-36. doi: 10.1016/s0006-3223(00)01024-6.
- Siegle GJ, Steinhauer SR, Friedman ES, Thompson WS, Thase ME. Remission prognosis for cognitive therapy for recurrent depression using the pupil: utility and neural correlates. Biol Psychiatry. 2011 Apr 15;69(8):726-33. doi: 10.1016/j.biopsych.2010.12.041.
- Siegle GJ, Steinhauer SR, Stenger VA, Konecky R, Carter CS. Use of concurrent pupil dilation assessment to inform interpretation and analysis of fMRI data. Neuroimage. 2003 Sep;20(1):114-24. doi: 10.1016/s1053-8119(03)00298-2.
- Urry HL, van Reekum CM, Johnstone T, Kalin NH, Thurow ME, Schaefer HS, Jackson CA, Frye CJ, Greischar LL, Alexander AL, Davidson RJ. Amygdala and ventromedial prefrontal cortex are inversely coupled during regulation of negative affect and predict the diurnal pattern of cortisol secretion among older adults. J Neurosci. 2006 Apr 19;26(16):4415-25. doi: 10.1523/JNEUROSCI.3215-05.2006.
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