Intraocular pressure and systemic blood pressure in the elderly

Area of Science:

• Ophthalmology
• Cardiology
• Geriatrics

Background:

• Intraocular pressure (IOP) is a key risk factor for glaucoma.
• Systemic factors like blood pressure and obesity may influence IOP.
• Understanding these relationships is crucial for managing eye health in aging populations.

Purpose of the Study:

• To investigate the relationship between systemic blood pressure, obesity, and intraocular pressure in individuals over 60.
• To identify specific blood pressure parameters (systolic, diastolic, mean) most correlated with IOP.
• To explore potential mechanisms linking obesity to altered aqueous humor dynamics.

Main Methods:

• Cross-sectional study of 573 general practice patients aged over 60.
• Measurements included intraocular pressure, systemic blood pressure (systolic, diastolic, mean), height, weight, and hemoglobin.
• Obesity assessed using the ponderal index.

Main Results:

• Intraocular pressure showed a significant positive correlation with both systemic blood pressure (P < 0.0001) and obesity (P < 0.01).
• Systolic blood pressure demonstrated the strongest correlation with intraocular pressure compared to diastolic or mean pressure.
• Obesity may potentially reduce the facility of aqueous humor outflow.

Conclusions:

• Elevated systolic blood pressure and obesity are independent risk factors for increased intraocular pressure in older adults.
• The systolic pressure head may increase aqueous humor filtration, leading to sustained IOP elevation.
• Obesity might impair aqueous humor outflow, contributing to higher intraocular pressure.