Intraocular PressureIPOFACONCT03016507
Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification
An observational study of Intraocular Pressure and Cataracts Senile, run by VER Excelência em Oftalmologia at 1 site in Brazil.
Trial summary
The objective of this study is to evaluate the IOP variation before and 30 days after performing phacoemulsification through pneumatic tonometry, in addition to evaluating the factors possibly related to this variation. Read more about this study
- Who is it for?
- Ages 18 to 80 years
- Conditions the study is for
- Intraocular Pressure, Cataracts Senile
- How many people
- 100 participants
- Where
- 1 siteBrazil
- Study dates
- Jul 2015to Jan 2017
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 80 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: People with cataract and with good systemic health
Who may be able to join
- older than 18 years
- deep anterior chamber visualized by the slit lamp with open angle estimation using the Van Herick technique
- IOP lower than 21 mmHg
- without surgical intercurrences, submitted to phacoemulsification
Who cannot join
- younger than 18 years
- shallow anterior chamber visualized by slit lamp with estimation of narrow angle
- preoperative surgical complications
- IOP greater than 21 mmHg
- contact lens wearers
- eye surgeries and/or ocular diseases and/or systemic disorders.
Trial locations and contacts
1 site in 1 country.
About this study
The objective of this study is to evaluate the IOP variation before and 30 days after performing phacoemulsification through pneumatic tonometry, in addition to evaluating the factors possibly related to this variation.
Read the detailed description
Cataracts represent the major cause of treatable blindness in developing countries. According to data , there are 45 million blind people in the world, of which 40% is due to cataract etiology. In Brazil, there are about 350,000 individuals blinded by cataracts.
One of the consequences observed after the cataract surgery is the variation of intraocular pressure (IOP). IOP is directly related to the volume of aqueous humor in the anterior chamber. Reports of oscillations after a cataract surgery range from +1.3 to -2.5 mmHg. The duration of this oscillation varies according to the literature studied. Some studies show that the oscillation seen in the first postoperative year was maintained for the 10-year period and was similar in patients of all ages. However, other authors have identified a non-permanent oscillation, which makes this topic controversial in ophthalmology.
There are a number of factors related to the degree of IOP reduction after a cataract surgery. Studies have shown that the preoperative IOP value, the depth of the anterior chamber, the volume of irrigation used during surgery and the age of the patients may interfere with the IOP variation in the postoperative period.
However, the gold standard tonometer for IOP measurement is Goldmann's. This measurement is closely related to important characteristics of the cornea, such as its thickness and curvature, and may underestimate or overestimate IOP values.
Another way to measure IOP is through a non-contact tonometer, blow or pneumatic. The blow tonometer has a pneumatic system that produces a jet of air, which leads to flattening of the cornea and on the surface of which a beam of parallel light rays is projected, in which only the reflected parallel and coaxial rays are picked up by the receiver of the device, obtaining a maximum peak of light reception when the cornea is flattened. Its main advantage is in its use in screening programs, the need for the use of eye drops and the lowest rates of contamination. The blow tonometer, as well as the flattening tonometer, is influenced by corneal factors, such as curvature and thickness, presenting the same parameters of under and overestimation of IOP.
The objective of this study is to evaluate the IOP variation before and 30 days after performing phacoemulsification through pneumatic tonometry, in addition to evaluating the factors possibly related to this variation.
- Conditions
- Intraocular Pressure, Cataracts Senile
- Keywords
- intraocular pressure, phacoemulsification, cataract
- Medical subject headings
- Cataract
What is being measured
The primary outcome is the main question the study is designed to answer.
Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification
Measured: Six months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted10 Jan 2017 (estimated)
- Study startJul 2015
- Primary completionJan 2017
- Study completionJan 2017
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (8)Papers the sponsor has linked to this study.
- Other trials for Intraocular PressureStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Time perspective
- Cross-sectional
- Enrolment
- 100 participants (actual)
Sponsor and investigators
- Lead sponsor
- VER Excelência em Oftalmologia
- Sponsor type
- University, hospital or other
- Collaborators
- Francisco Welington Rodrigues
- Responsible party
- Principal investigator, Rodrigo Egidio da Silva, VER Excelência em Oftalmologia
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT03016507
- Sponsor's protocol ID
- VEREO 3
- Acronym
- IPOFACO
- Status last verified
- Jan 2017
- First submitted
- 6 Jan 2017
- Last updated
- 10 Jan 2017
- Results posted
- No
- Data monitoring committee
- Yes
- Individual data sharing
- No
Publications
Poley BJ, Lindstrom RL, Samuelson TW, Schulze R Jr. Intraocular pressure reduction after phacoemulsification with intraocular lens implantation in glaucomatous and nonglaucomatous eyes: evaluation of a causal relationship between the natural lens and open-angle glaucoma. J Cataract Refract Surg. 2009 Nov;35(11):1946-55. doi: 10.1016/j.jcrs.2009.05.061.
PubMed 19878828Poley BJ, Lindstrom RL, Samuelson TW. Long-term effects of phacoemulsification with intraocular lens implantation in normotensive and ocular hypertensive eyes. J Cataract Refract Surg. 2008 May;34(5):735-42. doi: 10.1016/j.jcrs.2007.12.045.
PubMed 18471626Slabaugh MA, Bojikian KD, Moore DB, Chen PP. The effect of phacoemulsification on intraocular pressure in medically controlled open-angle glaucoma patients. Am J Ophthalmol. 2014 Jan;157(1):26-31. doi: 10.1016/j.ajo.2013.08.023. Epub 2013 Oct 30.
PubMed 24182743Damji KF, Konstas AG, Liebmann JM, Hodge WG, Ziakas NG, Giannikakis S, Mintsioulis G, Merkur A, Pan Y, Ritch R. Intraocular pressure following phacoemulsification in patients with and without exfoliation syndrome: a 2 year prospective study. Br J Ophthalmol. 2006 Aug;90(8):1014-8. doi: 10.1136/bjo.2006.091447. Epub 2006 May 3.
PubMed 16672324Bigger JF, Becker B. Cataracts and primary open-angle glaucoma: the effect of uncomplicated cataract extraction on glaucoma control. Trans Am Acad Ophthalmol Otolaryngol. 1971 Mar-Apr;75(2):260-72. No abstract available.
PubMed 4933971Yang HS, Lee J, Choi S. Ocular biometric parameters associated with intraocular pressure reduction after cataract surgery in normal eyes. Am J Ophthalmol. 2013 Jul;156(1):89-94.e1. doi: 10.1016/j.ajo.2013.02.003. Epub 2013 Apr 28.
PubMed 23628350Vincent SJ, Vincent RA, Shields D, Lee GA. Comparison of intraocular pressure measurement between rebound, non-contact and Goldmann applanation tonometry in treated glaucoma patients. Clin Exp Ophthalmol. 2012 May-Jun;40(4):e163-70. doi: 10.1111/j.1442-9071.2011.02670.x. Epub 2011 Oct 20.
PubMed 21883774Shingleton BJ, Pasternack JJ, Hung JW, O'Donoghue MW. Three and five year changes in intraocular pressures after clear corneal phacoemulsification in open angle glaucoma patients, glaucoma suspects, and normal patients. J Glaucoma. 2006 Dec;15(6):494-8. doi: 10.1097/01.ijg.0000212294.31411.92.
PubMed 17106361
Study at a glance
From the registry record, last updated by the sponsor on 10 Jan 2017. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification
- ClinicalTrials.gov ID
- NCT03016507
- Acronym / sponsor ID
- IPOFACO / VEREO 3
- Conditions
- Intraocular Pressure, Cataracts Senile
- Keywords
- intraocular pressure, phacoemulsification, cataract
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 100 participants (actual)
- Lead sponsor
- VER Excelência em OftalmologiaUniversity, hospital or other
- Collaborators
- Francisco Welington Rodrigues
- Study start
- Jul 2015
- Primary completion
- Jan 2017 (actual)
- Study completion
- Jan 2017 (actual)
- First posted
- 10 Jan 2017 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The objective of this study is to evaluate the IOP variation before and 30 days after performing phacoemulsification through pneumatic tonometry, in addition to evaluating the factors possibly related to this variation.
Detailed description
Cataracts represent the major cause of treatable blindness in developing countries. According to data , there are 45 million blind people in the world, of which 40% is due to cataract etiology. In Brazil, there are about 350,000 individuals blinded by cataracts.
One of the consequences observed after the cataract surgery is the variation of intraocular pressure (IOP). IOP is directly related to the volume of aqueous humor in the anterior chamber. Reports of oscillations after a cataract surgery range from +1.3 to -2.5 mmHg. The duration of this oscillation varies according to the literature studied. Some studies show that the oscillation seen in the first postoperative year was maintained for the 10-year period and was similar in patients of all ages. However, other authors have identified a non-permanent oscillation, which makes this topic controversial in ophthalmology.
There are a number of factors related to the degree of IOP reduction after a cataract surgery. Studies have shown that the preoperative IOP value, the depth of the anterior chamber, the volume of irrigation used during surgery and the age of the patients may interfere with the IOP variation in the postoperative period.
However, the gold standard tonometer for IOP measurement is Goldmann's. This measurement is closely related to important characteristics of the cornea, such as its thickness and curvature, and may underestimate or overestimate IOP values.
Another way to measure IOP is through a non-contact tonometer, blow or pneumatic. The blow tonometer has a pneumatic system that produces a jet of air, which leads to flattening of the cornea and on the surface of which a beam of parallel light rays is projected, in which only the reflected parallel and coaxial rays are picked up by the receiver of the device, obtaining a maximum peak of light reception when the cornea is flattened. Its main advantage is in its use in screening programs, the need for the use of eye drops and the lowest rates of contamination. The blow tonometer, as well as the flattening tonometer, is influenced by corneal factors, such as curvature and thickness, presenting the same parameters of under and overestimation of IOP.
The objective of this study is to evaluate the IOP variation before and 30 days after performing phacoemulsification through pneumatic tonometry, in addition to evaluating the factors possibly related to this variation.
Study design
- Time perspective
- Cross-sectional
Who may qualify
- Ages
- 18 to 80 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- People with cataract and with good systemic health
Key inclusion criteria (4 listed)
- older than 18 years
- deep anterior chamber visualized by the slit lamp with open angle estimation using the Van Herick technique
- IOP lower than 21 mmHg
- without surgical intercurrences, submitted to phacoemulsification
Key exclusion criteria (6 listed)
- younger than 18 years
- shallow anterior chamber visualized by slit lamp with estimation of narrow angle
- preoperative surgical complications
- IOP greater than 21 mmHg
- contact lens wearers
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification
Time frame: Six months
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 10 Jan 2017.
- Background: PubMed 19878828Poley BJ, Lindstrom RL, Samuelson TW, Schulze R Jr. Intraocular pressure reduction after phacoemulsification with intraocular lens implantation in glaucomatous and nonglaucomatous eyes: evaluation of a causal relationship between the natural lens and open-angle glaucoma. J Cataract Refract Surg. 2009 Nov;35(11):1946-55. doi: 10.1016/j.jcrs.2009.05.061.
- Background: PubMed 18471626Poley BJ, Lindstrom RL, Samuelson TW. Long-term effects of phacoemulsification with intraocular lens implantation in normotensive and ocular hypertensive eyes. J Cataract Refract Surg. 2008 May;34(5):735-42. doi: 10.1016/j.jcrs.2007.12.045.
- Background: PubMed 24182743Slabaugh MA, Bojikian KD, Moore DB, Chen PP. The effect of phacoemulsification on intraocular pressure in medically controlled open-angle glaucoma patients. Am J Ophthalmol. 2014 Jan;157(1):26-31. doi: 10.1016/j.ajo.2013.08.023. Epub 2013 Oct 30.
- Background: PubMed 16672324Damji KF, Konstas AG, Liebmann JM, Hodge WG, Ziakas NG, Giannikakis S, Mintsioulis G, Merkur A, Pan Y, Ritch R. Intraocular pressure following phacoemulsification in patients with and without exfoliation syndrome: a 2 year prospective study. Br J Ophthalmol. 2006 Aug;90(8):1014-8. doi: 10.1136/bjo.2006.091447. Epub 2006 May 3.
- Background: PubMed 4933971Bigger JF, Becker B. Cataracts and primary open-angle glaucoma: the effect of uncomplicated cataract extraction on glaucoma control. Trans Am Acad Ophthalmol Otolaryngol. 1971 Mar-Apr;75(2):260-72. No abstract available.
- Background: PubMed 23628350Yang HS, Lee J, Choi S. Ocular biometric parameters associated with intraocular pressure reduction after cataract surgery in normal eyes. Am J Ophthalmol. 2013 Jul;156(1):89-94.e1. doi: 10.1016/j.ajo.2013.02.003. Epub 2013 Apr 28.
- Background: PubMed 21883774Vincent SJ, Vincent RA, Shields D, Lee GA. Comparison of intraocular pressure measurement between rebound, non-contact and Goldmann applanation tonometry in treated glaucoma patients. Clin Exp Ophthalmol. 2012 May-Jun;40(4):e163-70. doi: 10.1111/j.1442-9071.2011.02670.x. Epub 2011 Oct 20.
- Background: PubMed 17106361Shingleton BJ, Pasternack JJ, Hung JW, O'Donoghue MW. Three and five year changes in intraocular pressures after clear corneal phacoemulsification in open angle glaucoma patients, glaucoma suspects, and normal patients. J Glaucoma. 2006 Dec;15(6):494-8. doi: 10.1097/01.ijg.0000212294.31411.92.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Intraocular Pressure and Cataracts Senile, run by VER Excelência em Oftalmologia at 1 site in Brazil.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 10 Jan 2017. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Brazil. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Intraocular Pressure Variation by Pneumatic Tonometer Before and After Phacoemulsification (time frame: Six months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT03016507, which also lists 8 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Jan 2017.