Patent ID: 9078595
Filing Date: 2015-07-14
Classification: A61B,A61F,H04N

Abstract:
1. An ophthalmic laser treatment apparatus for irradiating a patient's eye with a treatment laser beam for treatment, the ophthalmic laser treatment apparatus comprising: a light interference optical unit configured to acquire a depth profile of a patient's eye tissue, the light interference optical unit including: a measurement light source; a light splitter configured to split a light emitted from the measurement light source into a measurement light and a reference light, the measurement light being guided to and reflected at the patient's eye; a first focus position adjusting unit configured to adjust a focus position of the measurement light in the patient's eye tissue; and a detector configured to detect an interference state between the measurement light and the reference light, the measurement light being reflected at the patient's eye; an irradiation unit including: a second focus position adjusting unit configured to adjust a focus position of a laser beam in the patient's eye tissue; and an irradiation optical system configured to irradiate the patient's eye tissue with the treatment laser beam, the treatment laser beam being emitted from a laser source; a luminance transition information detecting unit configured to control the first focus position adjusting unit to shift the focus position of the measurement light so as to acquire a depth profile in each focus position, the luminance transition information detecting unit detecting luminance transition information of the depth profile when the focus position is shifted; a focused state detecting unit configured to detect a focused state in the patient's eye tissue based on the luminance transition information, the luminance transition information being acquired by the luminance transition information detecting unit; and a guide unit configured to guide the focus position of the laser beam based on a result of detection of the focused state detecting unit such that the focus position of the laser beam is adjusted to a targeted portion in the patient's eye tissue, wherein the luminance transition information detecting unit is configured to detect luminance transition information relating to at least two characterizing portions in the patient's eye tissue; the focused state detecting unit is configured to acquire the focused state based on a positional relationship between the two characterizing portions; and the luminance transition information detecting unit is configured to control the first focus position adjusting unit to shift the focus position of the measurement light such that a luminance level of reflected measurement light when the focus position is shifted to the characterizing portion is greater than a luminance level of reflected measurement light when the focus position is shifted to positions that are other than the characterizing portions.