Currently there are usually two methods of measuring the eye axis length, namely biometry and A-ultrasound.
Biometry utilizes an optical method to measure the eye axis, which can accurately measure the length of the eye axis, is relatively simple to operate, is non-contact, and is generally free of complications. However, the measurement value is not accurate if the patient’s lens is heavily clouded. Therefore, it is commonly used to measure the eye axis length in children and adolescents to assess the development of refractive errors such as myopia.
Ultrasound A is the use of ultrasound to detect the length of the eye axis, is a contact type, may be due to contact with the cornea surface inflammation, or due to contact with the cornea pressure on the eye caused by the incorrect value, is generally used for the lens turbidity is more serious patients, according to the length of the eye axis to assess the implantation of IOL degree.
It is recommended that patients seek medical attention and choose the appropriate measurement method according to the situation.