A new retinoscope with the ultrasonic distance measure instrument is designed for directly displaying the dioptre of artificial myopia caused by retinoscopy distance.Optometrist can obtain real dioptre of the patient if only adding the direct dioptre of artificial myopia to neutral dioptre obtained at roll-back point.This instrument can obviously increase the accuracy of refraction.

This paper introduces the feature of binocular indirect ophthalmoscope and its application in ophthalmologic examination and operation. Compared with direct ophthalmoscope, binocular indirect ophthalmoscope has many special advantages owing to its unique illumination system and principle of formation of image. Most of ocular fundus diseases can be diagnosed correctly by binocular indirect ophthalmoscope. The view is that the inspection technique of binocular indirect ophthalmoscope is the most convenient and predominant in fundus examination, ophthalmology operation and treatment until now, and is of value in use.

Objective To expand peripheral memory of DSP by using FMl8L08.Methods Because FMl8L08 not only can be randomly read in high speed,but is non-volatile and compatible with the pins of SRAM,the interface to TMS320F2812 was designed based on FMl8L08.Results FMl8L08 is used as TMS320F2812 peripheral memory expansion,instead of traditional separate ROM and RAM design,and be applied to the 12-lead ECG development.Conclusion This scheme can predigest software and hardware design complexity,enhance the system stabilization and decrease the power consumption.

This article is mainly about the application of wavefront aberration technology in clinical ophthalmology, including refractive surgery, cataract, retinal disease, ophthalmoxerosis, diplopia, keratoconus, etc. The wavefront aberration technology can not only be used to estimate the surgery method of cataract, but estimate the influence of IOL materials and designs on the human eye's image quality, all of which are intend to find the optimal treatment method, and to further decrease the impact that the glare disability and low visual acuity at night produce on the human eyes. Now, the prospect of wavefront aberration application on ophthalmology is cheerful, however, the specifical application technology of wavefront aberration is still in its infancy. The basic research about the accommodation, age and chromatic aberration needs to be intensified. So there is still a bunch of tasks that inferred the clinical ophthalmology application of wavefront aberration for us to process.

The conventional invasive tissue blood oxygen content measurement is poor in continuity.The weakness of the signal,strong interference and random transmission of the photon in tissues make the measurement difficult.Recently,near infrared spectrum technology has been applied to tissue blood oxygen content measurement.This paper presents a hardware design method for tissue blood oxygen content measurement by near infrared spectrum technology.

Objective To describe the US, CT, and MR imaging findings and diagnosis of hepatic adenomas. Methods The comprehensive imaging features in 6 patients with 6 hepatic adenomas confirmed pathologically were reviewed retrospectively and correlated with pathologic findings. Results One case was diagnosed correctly, four cases were mistaken for hepatocellular carcinomas (HCC), and one case was mistaken for focal nodular hyperplasia. US: six lesions were hypoechoic with hypohalo in four lesions, and there was low velocity arterial and venous flow within the six lesions. CT: six lesions were hypodense with pseudocapsule in four lesions, and the four lesions showed slight enhancement during arterial and portal venous phases, and one lesion showed moderate enhancement during arterial phase and slight enhancement during portal venous phase. MRI: six lesions had heterogeneously high signal intensity on T 1WI and T 2WI, and the high intensity on T 1WI remained unchanged after using fat saturation. Two lesions showed strong enhancement during arterial phase and slight enhancement during portal venous and delayed phases, and three lesions showed slight enhancement during arterial, portal venous, and delayed phases. Pseudocapsule detected in six lesions showed slight enhancement on portal venous or delayed phases. Conclusion The comprehensive imaging findings of hepatic adenomas were nonspecific. The presence of pseudocapsule, heterogeneous high signal intensity on T 1WI, and the high intensity remained unchanged after using fat saturation may help make a correct diagnosis of hepatic adenoma.