Myopia:the Role of Cone Opsin Mutations & Glasses That Control Axial Elongation
| Status: | Not yet recruiting |
|---|---|
| Conditions: | Ocular |
| Therapuetic Areas: | Ophthalmology |
| Healthy: | No |
| Age Range: | 8 - 13 |
| Updated: | 4/2/2016 |
| Start Date: | September 2013 |
| End Date: | December 2017 |
| Contact: | Jay Neitz, PhD |
| Email: | jneitz@uw.edu |
| Phone: | 206 543 8065 |
1. To determine the effect of spectacles with a red blocking filter on myopia progression
in children.
2. To determine the effect of spectacles with a holographic diffuser that spreads incident
light rays over an angle of 0.5 degrees on myopia progression in children
3. To determine the combined effects of spectacles with a red blocking filter and a
diffuser that spreads incident light over an angle of 0.5 degrees on myopia progression
in children.
in children.
2. To determine the effect of spectacles with a holographic diffuser that spreads incident
light rays over an angle of 0.5 degrees on myopia progression in children
3. To determine the combined effects of spectacles with a red blocking filter and a
diffuser that spreads incident light over an angle of 0.5 degrees on myopia progression
in children.
In this clinical trial we will determine whether commercially available lens tints that are
normally used for cosmetic purposes or for blocking sunlight have a beneficial effect of
slowing axial eye growth in children with myopia when used alone or in conjunction with a
holographic diffuser that blurs the image slightly.
The following procedures will be performed on a total of 240 children from 8 to 13 years of
age:
1. Color vision tests (Richmond Hardy-Rand-Rittler pseudoisochromatic plate test and/or
the Rayleigh match test and/or the Neitz Test of Color Vision), and machine-based
vision tests using the Titmus tester (color vision, binocularity, acuity, and
heterophoria tests);
2. each subject will provide a blood sample or a buccal swab for genetic analysis of the
long and middle wavelength cone photopigment genes in order to determine the
relationship between the cone opsins and myopia;
3. eye measurements including axial length and corneal curvature will be performed using
the Zeiss Intraocular Lens Master;
4. cycloplegic autorefraction will be doe at the beginning of the study before
participants start wearing the study spectacles, after 18 months if wearing the study
spectacles, and 6 months after participants stop wearing the study spectacles.
4) subjects will be randomly assigned to one of four groups, consisting of 60 subjects each,
each group will be assigned one of four study spectacles.
The study spectacles for all participants will have the optimal lens corrections for both
eyes.
Group 1 participants will wear spectacles with lenses tinted to blocks red light.
Group 2 participants will wear spectacles with lenses that have a holographic diffuser on
surface of and that are tinted to reduce the light intensity by the same amount that the
red-blocking tint does.
Group 3 participants will wear spectacles that are tinted to block red light and that have a
holographic diffuser.
Group 4 participants will wear spectacles that are tinted to reduces the light intensity by
the same amount that the red-blocking tint does.
Participants will wear the study glasses for 18 months. Axial length measurements will be
taken twice prior to when subjects begin wearing the glasses and once every three month
thereafter.
normally used for cosmetic purposes or for blocking sunlight have a beneficial effect of
slowing axial eye growth in children with myopia when used alone or in conjunction with a
holographic diffuser that blurs the image slightly.
The following procedures will be performed on a total of 240 children from 8 to 13 years of
age:
1. Color vision tests (Richmond Hardy-Rand-Rittler pseudoisochromatic plate test and/or
the Rayleigh match test and/or the Neitz Test of Color Vision), and machine-based
vision tests using the Titmus tester (color vision, binocularity, acuity, and
heterophoria tests);
2. each subject will provide a blood sample or a buccal swab for genetic analysis of the
long and middle wavelength cone photopigment genes in order to determine the
relationship between the cone opsins and myopia;
3. eye measurements including axial length and corneal curvature will be performed using
the Zeiss Intraocular Lens Master;
4. cycloplegic autorefraction will be doe at the beginning of the study before
participants start wearing the study spectacles, after 18 months if wearing the study
spectacles, and 6 months after participants stop wearing the study spectacles.
4) subjects will be randomly assigned to one of four groups, consisting of 60 subjects each,
each group will be assigned one of four study spectacles.
The study spectacles for all participants will have the optimal lens corrections for both
eyes.
Group 1 participants will wear spectacles with lenses tinted to blocks red light.
Group 2 participants will wear spectacles with lenses that have a holographic diffuser on
surface of and that are tinted to reduce the light intensity by the same amount that the
red-blocking tint does.
Group 3 participants will wear spectacles that are tinted to block red light and that have a
holographic diffuser.
Group 4 participants will wear spectacles that are tinted to reduces the light intensity by
the same amount that the red-blocking tint does.
Participants will wear the study glasses for 18 months. Axial length measurements will be
taken twice prior to when subjects begin wearing the glasses and once every three month
thereafter.
Inclusion Criteria:
- nearsighted having a refractive error of at least -0.5 diopters
- myopia progression at least -.50 D per year in previous year
- astigmatism and anisometropia not more than 1.5 D
- distance monocular acuity 6/6 or better
- near monocular acuity of 0.4 M or better
- stereoacuity not more than 40 sec of arc at 40 cm
- able to respond to subjective testing
- no contact lens use during the study
- able to comply with wearing the experimental lenses daily for 18 months
- able to have axial length measurements accurately on the Zeiss Intraocular Lens
Master
- willing to donate a blood sample or a buccal swab for genetic analysis
- can be refracted to 20/20 or 20/15
Exclusion Criteria:
- glaucoma, amblyopia, strabismus
- ocular disease
- developmental delay
- history of wearing bifocal lenses
- any type of eye surgery
- color vision deficiency
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