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Orthoptic Changes Following Photorefractive Keratectomy

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT01279993
First Posted: January 20, 2011
Last Update Posted: January 20, 2011
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
Shahid Beheshti University of Medical Sciences
  Purpose
Purpose: To detect orthoptic changes in patients undergoing photorefractive keratectomy (PRK). Method: This interventional case series was performed on 297 eyes of 150 patients who were candidates for PRK. Complete ophthalmic evaluations focusing on orthoptic examinations were performed before and 3 months after PRK. Results: Before PRK, two (1.3%) patients had esotropia that remained unchanged postoperatively. However, 3 (2%) patients had distance exotropia preoperatively which improved after PRK. Of 12 cases (8%) with preoperative exotropia at near, 3 (2%) cases became orthophoric. Six patients (4%) developed postoperative near exotropia. A significant reduction in means of convergence and divergence amplitudes (P<0.001) and a meaningful increase in mean of near point of convergence (NPC) (P<0.006) were noticed after PRK. A reduction of ≥10 PD in convergence amplitude and ≥5 PD in divergence amplitude were detected in 10 and 5 patients, respectively. Four patients had an preoperative NPC>10 cm which was not changed by the surgery. Out of 9 (6%) patients with baseline stereopsis >60 seconds of arc, 2 (1.33%) cases showed an improvement in stereopsis following PRK. None of the patients complained of postoperative diplopia. Conclusion: Eye deviation in patients undergoing PRK may improve or remain unchanged after operation and postoperative deviations can develop following this surgery. Diminishing of fusional amplitude and increasing of NPC as well as improving of stereopsis may also happen after PRK. Therefore, a preoperative orthoptic examination in patients with any concerning histories and/or motility issues on routine exam is recommended before performing PRK.

Condition Intervention Phase
Orthoptic Changes Procedure: Kerato refractive Surgery Phase 3

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Primary Purpose: Supportive Care
Official Title: Orthoptic Changes Following Photorefractive Keratectomy

Further study details as provided by Shahid Beheshti University of Medical Sciences:

Primary Outcome Measures:
  • orthoptic changes [ Time Frame: before and after KRS ]
    Prism / (deviation)


Secondary Outcome Measures:
  • VA , Streopsis , deviation , fusion , NPC [ Time Frame: before and after KRS ]
    Snellen , Titmus, prism, ruler


Study Start Date: April 2008
Study Completion Date: April 2009
Primary Completion Date: January 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Kerato refractive Surgery Procedure: Kerato refractive Surgery
This interventional case series was performed on 297 eyes of 150 patients who were candidates for PRK. Complete ophthalmic evaluations focusing on orthoptic examinations were performed before and 3 months after PRK.

  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 59 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

>18 yrs / refractive errors / with consent

Exclusion Criteria:

< 18 / corneal opacity - keratoconus

Dry eye / diabetes / collages vacuolar disease

  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01279993


Locations
Iran, Islamic Republic of
Labbafinejad medical center
Tehran, Iran, Islamic Republic of
Sponsors and Collaborators
Shahid Beheshti University of Medical Sciences
Investigators
Principal Investigator: zhaleh rajavi, Assistant Professor Imam Hossein Medical Center
  More Information

Responsible Party: Zhale Rajavi, Ophthalmic Research center
ClinicalTrials.gov Identifier: NCT01279993     History of Changes
Other Study ID Numbers: 8659
First Submitted: January 19, 2011
First Posted: January 20, 2011
Last Update Posted: January 20, 2011
Last Verified: April 2008