Clinical Trial: Binocular Vision in Monocular Pseudophakia

Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Interventional

Official Title: A Prospective Randomised Controlled Trial to Assess Improved Binocular Visual Function in Young Patients Undergoing Monocular Cataract Surgery With a Bifocal Intraocular Lens.

Brief Summary: Following cataract surgery, an intraocular lens (IOL) is implanted in the eye. The majority of people develop an operable cataract when they are over the age of 50. Occasionally people under 50 years develop a cataract requiring an operation. The visual demands in this age group are very different due to both physiological and lifestyle factors. Traditionally IOLs are focussed for distance vision and additional spectacles are worn for near vision. Under the age of 45 years we have the ability to naturally change the focus of our eyes and do not require additional reading glasses. This is known as accommodation. By removing the cataractous lens and replacing it with an IOL with a fixed single focus, both eyes work together for distance vision but only the unoperated eye is able to change focus for different working distances. This study aims to establish whether a multifocal IOL implanted in one eye is able to complement the accommodation in the other eye so the 2 eyes work more effectively together. This may enhance depth perception and improve the quality of vision. Depth perception is important for more comfortable vision on the computer screen, when reading and for jobs that require good depth perception.

Detailed Summary:
Sponsor: University of Oxford

Current Primary Outcome: Extent of binocular vision at near working distance following IOL implantation. [ Time Frame: 3-6 months ]

Original Primary Outcome: Same as current

Current Secondary Outcome: Change in visual acuity and subjective visual comfort at distance, intermediate and near working distances following IOL implantation. [ Time Frame: 3-6 months ]

Visual acuity at different distances will be presented in combination as they are linked.


Original Secondary Outcome: Same as current

Information By: University of Oxford

Dates:
Date Received: May 1, 2013
Date Started: April 2013
Date Completion: December 2017
Last Updated: February 19, 2016
Last Verified: February 2016