Biomedical subjects

T Hikichi

Publications and source records attributed to T Hikichi.

75 records · Page 5Linked to original sources

PubMedDate not supplied

Three-dimensional characteristics of macular pseudoholes using confocal laser tomography.

BACKGROUND: Epiretinal membranes with macular pseudoholes are sometimes confused with full-thickness macular holes. Because both the natural course and clinical management of the two differ, an accurate differential diagnosis is needed. PATIENTS AND METHODS: We obtained three-dimensional images of macular pseudoholes in 12 eyes using the Heidelberg retina tomograph (HRT). Another 15 eyes with a full-thickness macular hole were also studied. In addition, we measured the area and the maximum depth of both types of holes. RESULTS: Irregular rippling undulations were frequently observed on the three-dimensional topographic maps around the pseudoholes, whereas elevated cuffs were observed around the full-thickness holes. The maximum depth of the macular pseudoholes (mean, 57 microm) was significantly shallower than that of the full-thickness macular holes (mean, 156 microm; P < 0.01). CONCLUSION: Three-dimensional images obtained by the HRT and the measurement of the maximum depth may be useful in differentiating macular pseudoholes from full-thickness macular holes.

Aged↗

PubMedDate not supplied

Prevalence of posterior vitreous detachment in retinitis pigmentosa.

To investigate the prevalene of posterior vitreous detachment (PVD) and PVD with collapse in relation to age in eyes with retinitis pigmentosa (RP), we retrospectively studied the vitreous condition in 218 eyes of 109 patients with RP. Two hundred thirty healthy eyes of 115 subjects served as controls. The prevalence of both PVD and PVD with collapse, respectively, in the first through the sixth decades of life, and the second through the seventh decades was significantly higher in the RP eyes than in the controls (P < .01). Our findings demonstrated the early onset and progression of PVD with age in the eyes with RP as compared with the control eyes.

Adolescent↗

PubMedDate not supplied

Comparison of the prevalence of posterior vitreous detachment in whites and Japanese.

The vitreous condition of healthy white (n = 551) and Japanese (n = 528) eyes were reviewed and compared with respect to the prevalence of posterior vitreous detachment (PVD) in the two groups. No white or Japanese patient 39 years of age or younger had PVD; the prevalence among those older than 39 increased with age in the fifth through the ninth decades, i.e., respectively, to 4%, 24%, 37% 59%, and 87% in the whites, and to 5%, 21%, 43%, 72%, and 82% in the Japanese. In none of these decades was there any significant difference between the prevalence of complete or partial PVD in the whites and the Japanese. This finding is significant because the vitreoretinal relationship influences the development and prognoses of the various vitreoretinal disorders.

Adolescent↗