Abstract
Background and objectives: The optic nerve is a component of the central nervous system, and the optic nerve sheath is connected to the subarachnoid space. For this reason, intracranial pressure (ICP) increases are directly transmitted to the optic nerve sheath. Knowing the normal optic nerve sheath diameter (ONSD) range in a healthy population is necessary to interpret this measurement as a sign of intracranial pressure in clinical practice and research. In this study, we aimed to determine the standard ONSD value in healthy adultsaged65 years of age or older who had not previously been diagnosed with a disease that could increase the ICP. Materials and Methods: The right and left ONSD values and ONSD differences were compared, according to the gender of the patients. The patients were divided into 3 groups, according to their age. The age groups were assigned as follows: Group 1: 65–74 years of age; Group 2: 75–84 years of age; and Group 3: 85 years of age or older. The ONSDs and the ONSD difference between the left and right eyes of Group 1, Group 2 and Group 3 were compared. Results: The study included 195 volunteers. The mean ONSD of both eyes was 4.16±0.69 mm, and the difference between the ONSD of the left and right eyes was 0.16±0.18 mm. There was no difference between genders in terms of right ONSD, left ONSD, mean ONSD and ONSD difference between the left and right eyes. There was no correlation between age and ONSD and ONSD difference. When the age groups and ONSD were compared, no difference was found between the groups. Conclusions: In conclusion, the ONSDs of both eyes do not vary with age in healthy adults aged65 years or older. ONSD does not vary between genders. The calculation of ONSD difference can be used to determine ICP increase.
Highlights
Aging can be defined as gradual changes in the body structure that are not caused by any disease or trauma [1]
In conclusion, the optic nerve sheath diameter (ONSD) of both eyes do not vary with age in healthy adults aged65 years or older
In a study on healthy Pakistani adults, with a mean age of 31.08 ± 5.90 years, the median ONSD of the right eye was measured at 4.84 mm, and 95% of individuals had an ONSD in the range of 4.84–4.97 mm, while the median ONSD of the left eye was measured at 4.86 mm, and 95% of individuals had an ONSD in the range of 4.85–4.96 mm
Summary
Aging can be defined as gradual changes in the body structure that are not caused by any disease or trauma [1]. Intracranial pressure (ICP) is the pressure caused by the total brain volume, cerebrospinal fluid (CSF) and blood in the skull, and it is stable. The optic nerve is a component of the central nervous system, and the optic nerve sheath is connected to the subarachnoid space For this reason, intracranial pressure (ICP) increases are directly transmitted to the optic nerve sheath. We aimed to determine the standard ONSD value in healthy adultsaged years of age or older who had not previously been diagnosed with a disease that could increase the ICP. Materials and Methods: The right and left ONSD values and ONSD differences were compared, according to the gender of the patients. The mean ONSD of both eyes was 4.16±0.69 mm, and the difference between the ONSD of the left and right eyes was
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