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Iris melanocytes are innervated by parasympathetic and sympathetic nerve endings. Light affects autonomic nervous system activity via the retino-hypothalamic pathway. The hypothesis that the day-to-night variations in the sympatovagal ratio (LF/HF) may differ among individuals with different brown iris patterns was tested.
A total of 621 healthy adults, aged between 16 and 50, with brown eyes and not diagnosed with a disease that might affect the autonomous nerve system were included in the study. A digital camera was used to acquire iris photos. Subjects were grouped into iris color groups (2-0 bg, 1-0 bg, 1-1 db, 1-1 lb, 2-0 b, and 1-0 b). Iris photos were analyzed with Picture Color Analyzer RBG software. The Central/Peripheral (R/RGB) ratio was used for objective distinction between the groups. Using 24-h Holter ECG monitoring, the change in the sympathovagal ratio from day (between 07:00 and 23:00 hrs) to night (between 23:00 and 07:00 hrs) was determined with the formula [(Day - Night) LF/HF)/Day LF/HF].
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 2-0 darkbown-green (2-0 bg) | Those with distinctively dark brown in the central area, slightly green in the peripheral area, |
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| 1-0 lightbrown-green (1-0 bg). | Those with slightly dark brown in the central area and green in the peripheral area, |
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| dark brown (1-1 db) | Eyes with the same color structure in the central iris and the peripheral iris. |
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| light brown (1-1 lb) | Eyes with the same color structure in the central iris and the peripheral iris. |
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| dark brown (2-0 b) | Those with distinctively dark brown in the central iris area compared to the periphery . |
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| slightly dark brown (1-0 b) |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Iris Color Measurement , LF/HF Measurement | Other | Iris Color Measurement (Photos were taken of the iris with a digital camera ) LF/ HF Measurement (Using the three-channel standard ambulatory Holter recording system) |
| Measure | Description | Time Frame |
|---|---|---|
| LF/HF ratio | low frequency (LF, 0.04-0.15 Hz) and high frequency (HF, 0.16-0.4 Hz) measurements were taken from day and night changes in the heart rate by using the frequency-domain analysis method. | one week |
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Inclusion Criteria:
A total of 650 healthy individuals between the ages of 16 and 50 .
Exclusion Criteria:
Diseases that could affect the autonomic nervous system; Obesity Obstructive sleep apnea syndrome Hypertension Diabetes mellitus Atrial fibrillation Coronary disease Heart failure Goiter, etc.
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A total of 650 healthy individuals between the ages of 16 and 50 who applied for cardiac examination and had normal findings were recruited for the study.
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| ID | Term |
|---|---|
| D007499 | Iris Diseases |
| ID | Term |
|---|---|
| D014603 | Uveal Diseases |
| D005128 | Eye Diseases |
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Those with slightly dark brown (1-0 b) in the central iris area compared to the periphery .
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