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Myopia is a public health problem, affecting the general population worldwide. The common modalities for correcting myopia include spectacles, contact lenses, and surgical procedures. Cycloplegic refraction is considered the gold standard for measuring refractive errors, especially in children. It has been well-established that generally myopia could be overestimated and hyperopia be underestimated if refraction was performed without cycloplegia.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Cycloplegic refraction | Other | All refractions were measured before and after cycloplegic addition to the eye. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Cycloplegics | Drug | they are drugs that paralyze the ciliary muscles and cause relaxation of accommodation. |
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| Measure | Description | Time Frame |
|---|---|---|
| Sphere of the eye | It means that the correction for nearsightedness or farsightedness is spherical, equal in all meridians of the eye. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness. If the number appearing under this heading has a minus sign (-), you are nearsighted; if the number has a plus sign (+) or is not preceded by a plus sign or a minus sign, you are farsighted. It is measured by Auto-refractor | Baseline |
| Sphere of the eye | It means that the correction for nearsightedness or farsightedness is spherical, equal in all meridians of the eye. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness. If the number appearing under this heading has a minus sign (-), you are nearsighted; if the number has a plus sign (+) or is not preceded by a plus sign or a minus sign, you are farsighted. It is measured by Auto-refractor | Immediate after 30 minutes of cycloplegic addition |
| cylinder of the eye | This indicates the amount of lens power for astigmatism and represents the difference in the greatest and weakest powers of the eye, usually separated by 90 degrees. If nothing appears in this column, either you have no astigmatism, or your astigmatism is so slight that it is not necessary to correct it with your eyeglass lenses. The number in the cylinder column may be preceded with a minus sign (for the correction of nearsighted astigmatism) or a plus sign (for farsighted astigmatism). Cylinder power always follows sphere power in an eyeglass prescription. It is measured by Autorefractor. | Baseline |
| cylinder | This indicates the amount of lens power for astigmatism and represents the difference in the greatest and weakest powers of the eye, usually separated by 90 degrees. If nothing appears in this column, either you have no astigmatism, or your astigmatism is so slight that it is not necessary to correct it with your eyeglass lenses. The number in the cylinder column may be preceded with a minus sign (for the correction of nearsighted astigmatism) or a plus sign (for farsighted astigmatism). Cylinder power always follows sphere power in an eyeglass prescription. It is measured by Autorefractor |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Ehab tharwat | Damietta | New Damietta | 34517 | Egypt |
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| ID | Term |
|---|---|
| D009184 | Mydriatics |
| ID | Term |
|---|---|
| D001337 | Autonomic Agents |
| D018373 | Peripheral Nervous System Agents |
| D045505 | Physiological Effects of Drugs |
| D020228 | Pharmacologic Actions |
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| Immediate after 30 minutes after cycloplegia |
| D020164 | Chemical Actions and Uses |