Optical Defocus to Stimulate Eye Elongation in Hyperopia (ODSEEH)

Study Description

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Brief Summary:

Axial hyperopia results when the length of the eye is too short for the eye to properly focus distance objects on the retina while the focusing system is relaxed. Emmetropization is the process by which the eye actively adjusts various components of the eye to gradually improve the focus of the eye. Emmetropization frequently involves either an increase or a decrease in the growth of the eye, particularly during infancy and childhood. Numerous animal studies suggest that if an animal is exposed to retinal images located behind the retina either centrally or peripherally, the eye will grow in the direction of the focused image. If an abnormally short eye has resulted in hyperopia, exposing such an eye to retinal images partially located behind the retina might encourage axial elongation, thus reducing the hyperopia.

Condition or disease	Intervention/treatment	Phase
Hyperopia; Refractive Error	Device: Simultaneous Vision Bifocal Soft Contact Lenses; Device: Single Vision Soft Contact Lenses	Not Applicable

Detailed Description:

Hyperopia or farsightedness may cause distance vision and near vision to be blurred. Depending on the severity of the condition and the age of the patient and the status of the binocular vision system, hyperopia can also cause fatigue, asthenopia, headaches, double vision, and amblyopia. Low to moderate amounts of hyperopia rarely cause much difficulty in the young person, but will eventually cause significant near vision problems as the patient ages. Hyperopia can be caused by the eye being too short (axial hyperopia) or by the cornea being too flat or the crystalline lens being to weak (refractive hyperopia). It has been established by the PI that axial growth can be dramatically lessened in children and adolescents with myopia through the use of bifocal contact lenses prescribed in a particular way (The CONTROL Study). Studies by Earl Smith, O.D., Ph.D. have suggested that multi-zonal contact lenses that provide proper axial focus while manipulating peripheral defocus can either discourage or encourage axial growth to treat myopia or hyperopia respectively. In the present study, simultaneous vision bifocal soft contact lenses will be used to encourage axial growth in hyperopic children and adolescents with axial hyperopia in an effort to reduce hyperopia. Subjects will be randomly assigned to wear either bifocal soft contact lenses or single vision soft lenses. The bifocal contact lenses will be prescribed to provide for clear central vision at both distance and near with the near zone of the contact, thus exposing the retina to hyperopic defocus from the distance zone.

Study Design

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Study Type :	Interventional (Clinical Trial)
Estimated Enrollment :	30 participants
Allocation:	Randomized
Intervention Model:	Parallel Assignment
Masking:	Triple (Participant, Care Provider, Investigator)
Primary Purpose:	Treatment
Official Title:	Use of Multifocal Contact Lenses to Stimulate Axial Elongation in Axial Hyperopia
Study Start Date :	January 2015
Estimated Primary Completion Date :	June 2018
Estimated Study Completion Date :	September 2018

Arms and Interventions

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Arm	Intervention/treatment
Experimental: Bifocal Contact Lenses; Simultaneous Vision Bifocal Soft Contact Lenses will be prescribed such that the distance vision as measured by manifest subjective refraction will be properly corrected by the near vision add power and undercorrected by the distance power.	Device: Simultaneous Vision Bifocal Soft Contact Lenses; Simultaneous Vision Bifocal Soft Contact Lenses will be prescribed such that the distance vision as measured by manifest subjective refraction will be properly corrected by the near vision add power and undercorrected by the distance power.
Placebo Comparator: Single Vision Soft Contact Lenses; Subjects will be fitted with single vision soft contact lenses with goal of corrected emmetropia at a distance of 20 feet.	Device: Single Vision Soft Contact Lenses; Single vision soft contact lenses will be prescribed to properly correct the distance vision as measured by manifest subjective refraction.

Outcome Measures

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Primary Outcome Measures :

1. Axial length [ Time Frame: One year ]

Secondary Outcome Measures :

1. Refractive Error [ Time Frame: One year ]

Eligibility Criteria

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Ages Eligible for Study:	5 Years to 12 Years (Child)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	Yes

Criteria

Inclusion Criteria:

• Aged 5-12
• Hyperopia > +1.25 each eye (cycloplegic refraction)
• Ability to wear soft contact lenses

Exclusion Criteria:

• Amblyopia
• Strabismus
• Astigmatism > 1.00 diopters
• Axial Length > 24.00 mm

Contacts and Locations

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Locations

United States, California
711 Kains Ave
San Bruno, California, United States, 94066

Sponsors and Collaborators

Aller, Thomas A., OD

Investigators

Principal Investigator:	Thomas A Aller, O.D.	Unafilliated

More Information

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Responsible Party:	Aller, Thomas A., OD
ClinicalTrials.gov Identifier:	NCT00950924 History of Changes
First Posted:	August 3, 2009
Last Update Posted:	November 28, 2017
Last Verified:	November 2017

Keywords provided by Aller, Thomas A., OD:

Hyperopia; Refractive Error; Ocular Biometrics	Axial Length; Contact Lenses; Bifocal Contact Lenses

Additional relevant MeSH terms:

Refractive Errors; Hyperopia; Eye Diseases