Gastric carcinoma is the most common malignancy in Korea. The peak incidence of gastric carcinoma is over 50 years of age and male predominance, about 2:1. Computed tomography scan is the one of the most useful diagnostic tool for evaluation of extension, staging and operability of gastric carcinoma. For evaluation of the utility of the preoperative computed tomography scan in gastric carcinoma, surgically proved 72 cases of gastric carcinoma were analyzed by modified Moss classification¹⁾ based on computed tomography scan and pathological classification.

The results were as follows ;

1) The accuracy of computed tomography scan in each stage of gastric carcinoma was 100% in stage I. 67% in stage II. 69% in stage III. and 85% in stage IV.

2) The overall accuracy of computed tomography scan for staging of gastric carinoma was 72%.

3) The accuracy of computed tomography scan for detection of regional lymph node metastasis was 78%. and 90% for retroperitineal lymph node metastasis.

4) The accuracy of computed tomography scan for detection of distant metastasis was 90%.

5) Computed tomography scan was the most useful diagnostic method for evaluation of extension and metastasis of gastric carcinoma and it is necessary for treatment planning and prognostic evaluation before surgery.

Clinically, the diagnostic method of dry eye and adaptation of contact lens wearing have been the slit lamp examination, tear film break up time(BUT) measurement and Schirmer test. There have been many reports that Schirmer test and BUT measurement can be influenced by may factors, especially the mothods of measuring it. So the question of their repeatability and reproducibility has not yet been solved.

We studied the influence of contact lens wearing on the tear film phenol red thread test between contact lens wearers and non-wearers.

The results as follows:

1) The mean value measured by the PRT method was 13.92±7.68mm in right eye, 15.03±7.68mm in right eye, 21.48±6.30mm in left eye among the contact lens-non wearing group.

2) There was statistically significant decreased value of PRT in the contact lens wearing group.

3) There was not statistically significant difference between contact lens type, duration of contact lens wearing, duration of exchanging of contact lens, contact lens wearing time perone day.