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Biomedical subjects

F Kayazawa

Publications and source records attributed to F Kayazawa.

34 records · Page 2Linked to original sources

Acute posterior multifocal placoid pigment epitheliopathy and Harada's disease.

Two healthy Japanese patients developed bilateral pigment epitheliopathy. No inflammatory sign was observed at the time of onset. Multiple yellowish-white placoid lesions developed in the macular region after which vision was seriously disturbed. Fluorescein angiography showed hypofluorescence at the early stage and hyperfluorescence at the later stage--a finding coincident with the placoid lesions. In Case 1 a similar attack in the right eye occurred half a year later, and of the left eye seven years later. New placoid lesions were observed at sites of previous lesions and also at new sites. Lesions of both fundi resolved, rapidly leaving pigment clumps, and visual prognosis was good. The clinical experience of Case 1 were quite similar to acute posterior multifocal placoid pigment epitheliopathy (APMPPE). In Case 2 the placoid lesions spontaneously resolved within a month. However, fluorescein angiography showed multiple pinpoint leaks occurring at the level of the pigment epithelium, and at the resolved stage a "sunset glow" fundal appearance was observed. The second attack was observed four months after the first onset, with iridocyclitis accompanying it. These clinical features were similar to Harada's disease while some were similar to APMPPE.

Adult

Contrast sensitivity measurement in retinal diseases by laser generated sinusoidal grating.

The contrast sensitivity function (CSF) of 83 patients with retinal diseases was measured by laser-generated sinusoidal grating pattern, which enables the direct measurement of the CSF between the retina and the brain. The CSF abnormality in various retinal diseases was not specific to each disease, and the severity may determine the pattern. The abnormal patterns and rough correlation with visual acuity (V.A.) are: (1) attenuation at high frequency ranges (V.A. greater than 0.8), (2) attenuation at intermediate and high frequency ranges (0.4 less than V.A. less than 0.7), (3) attenuation at all frequency ranges (V.A. less than 0.3). Some cases, however, showed discrepancy between visual acuity and CSF. At the recovery stage of central serous retinopathy and retinal branch vein occlusion, CSF showed delayed recovery or attenuated sensitivity even when visual acuity was restored to 1.0 or more. In retinitis pigmentosa and pre-retinal macular fibrosis, CSF showed more sensitive detection of abnormal macular function than visual acuity measurement. At the post-corticosteroid therapy of Harada's disease and Sympathetic Ophthalmia, CSF recovered more rapidly than visual acuity when retinal detachment was absorbed. Those discrepancies suggest that CSF measurement may be useful for evaluating progression or regression of these diseases.

Adolescent

Temporal modulation transfer function in patients with retinal diseases.

The temporal modulation transfer function (temporal MTF) was measured in normal controls and in patients with various retinal diseases. Temporal MTF of controls showed band-pass filter properties, having a peak sensitivity at about 10 Hz at 1,000 Troland of retinal luminance. As the retinal luminance was reduced, the sensitivity decreased first at high temporal frequencies; then the peak sensitivity decreased, and finally at low temporal frequencies the sensitivity decreased and the peak shifted to the left. In retinal diseases, abnormal temporal MTFs were detected, and the curves were very similar to those of normal controls when retinal luminance was reduced. These patterns were not specific to any retinal diseases, and the severity of the conditions seemed to determine the pattern.

Adult

Temporal contrast sensitivity in central serous choroidopathy.

Temporal contrast sensitivity (TCS), a function of foveal sensitivity to sinusoidally modulated stimuli, was measured in 35 patients with central serous choroidopathy. Attenuation of the sensitivity at high temporal frequency was observed even when visual acuity was not impaired. In patients whose visual acuity was impaired, attenuation of the sensitivity of middle and/or low frequency as well as at high frequency was observed. In many cases TCS recovered to various degrees as the condition improved, even when little recovery of visual acuity was observed.

Adult

Central serous choroidopathy with exudative retinal detachment.

An exudative retinal detachment that may be a severe type of central serous choroidopathy (CSC) developed in ten patients. These patients were all middle-aged, all but one were men, and all had a tendency of bilateral involvement. The retinal detachment was associated with doughnut-shaped exudative flecks, and the shifting of subretinal fluid with head position was observed in some cases. Fluorescein angiography revealed wide-ranged retinal pigment epithelial disturbances and effusive dye leakages, especially descending leakage. Treatment with steroids and antibiotics was ineffective, and photocoagulation resolved these conditions rapidly, otherwise spontaneous improvement occurred. The final visual outcomes were variable, and in some cases permanent visual loss occurred.

Adult

A case of central serous choroidopathy with peripheral retinal detachment.

A case of bilateral CSC is reported: a 36-year-old man, whose fluorogram showed a peculiar change of leak type, namely smokestack phenomenon to ink-blot, and then to descending type in succession. As the leak type changed to descending type, serous detachment of the macula extended to the inferior periphery, and shifting of subretinal fluid occurred.

Adult

Severe retinal vascular lesions in systemic lupus erythematosus.

Retinal lesions in systemic lupus erythematosus (SLE) are usually closely related to the patient's general condition and occur frequently in severe states such as renal or central nervous system involvement. However, improved treatment of SLE has reduced retinal involvement, and it is rare today to observe severe retinal lesions in patients with SLE. We report two cases of severe retinal vascular lesions in SLE patients who developed otherwise unremarkable systemic manifestations and laboratory findings.

Adult

Choroidal osteoma: two cases in Japanese women.

Two cases of choroidal osteoma in otherwise healthy Japanese women are presented; the first case resembled a macular degeneration with subretinal neovascularization, the other, a diffuse amelanotic choroidal melanoma. With advanced ancillary diagnostic methods and changing concepts of prognosis and treatment of choroidal melanoma, a small atypical or doubtful choroidal melanoma should be studied carefully before hasty enucleation.

Adult

A case of sympathetic uveitis.

A 38-year-old man developed sympathetic uveitis on the 26th day after his injury. Heavy systemic corticosteroid therapy did not work well at the early stage. Enucleation was not carried out, and systemic and local steroid therapy were continued persistently. In the fourth month after the onset, visual acuity of the sympathized eye returned abruptly to a normal level. In this case, the mechanism of the abrupt recovery is probably spontaneous improvement, and this case alerts the clinician that the enucleation of the injured eye should seldom be performed even if heavy doses of corticosteroid do not work well at the early stage.

Adult