Myopia
Conditions
Keywords
Effects, Heat, Light
Brief summary
Myopia, the most common human eye disorder, is a phenomenon characterized by an unconstrained elongation of the eye globe There are number of theories concerning the environmental effect on the emmetropization process, most are related to childhood exposure to outdoor activity, near work and sleep with night light. Studies in lab animals found an association between intensity of ambient lighting and myopia development. In this study, the investigators will examine the ambient light in kindergarten and schools and their relation to refractive error. Diurnal luminance in kindergarten and school class room will be measured and correlated to biometric measures such as refraction, axial length and keratometry.
Interventions
OTHERautorefractometer, A-scan ultrasound
A measurement of refraction will be made by the Autorefractometer. A measurement of the eyes' biometer data will be made by A-scan ultrasound.
Sponsors
Hillel Yaffe Medical Center
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
4 Years to 17 Years
Healthy volunteers
Yes
Inclusion criteria
* Every child that have been studying in the same class for the last 6-12 months (kindergarten and school respectively).
Exclusion criteria
* Noncooperative child or parents. * Ocular surgery. * Ocular genetic disease.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| the relation between the level of myopia and light intensity | change from baseline at the start point of the study, after 6 months and after 12 months | an analysis of the correlation between the two variables. the data will be collected as reported in the secondary outcome measures (number 2 and 5). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| levels of ambient light intensity | natural light- start of study and once a month until completion, average of 1 year. artificial light- once at the start point of the study | Classes that are influenced by sunlight will be examined for light levels at a specific day of each month . For classes that are not influenced by sunlight, light source and levels will be documented. the measurement will be held until study completion. will be measured by luxmeter. the results will be in LUX (standardised unit of measurement of light intensity) |
| measurement of axial length | change from baseline at the start point of the study, after 6 months and after 12 months | will be measured using A-scan ultrasound. the results will be in millimeters. |
| measurement of Visual acuity | change from baseline at the start point of the study, after 6 months and after 12 months. | will be measured using LogMAR chart. |
| measurement of refraction | change from baseline at the start point of the study, after 6 months and after 12 months. | will be measured using autorefractometer. the results will be in diopter |
| measurement of cornea curvature | change from baseline at the start point of the study, after 6 months and after 12 months. | will be measured using autorefractometer. the results will be in millimeters. |
Outcome results
None listed