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Biomedical subjects

Y Biger

Publications and source records attributed to Y Biger.

7 recordsLinked to original sources
PubMed1992

The incidence of myopia in the Israel Air Force rated population: a 10-year prospective study.

It is important to define the risk in pilots of becoming myopic in order to determine the need for yearly screening, and to predict pilot eligibility in environments where the use of corrective lenses may present problems. We conducted a prospective study of 1400 air force personnel followed for 10 years, who could be divided into three major groups; those with 20/20 vision in both eyes, those with 20/25 in one eye only and whose vision was 20/20 using both eyes together, and those who were accepted despite the fact that they required corrective lenses. Over the 10-year period, 23.1% of those with 20/25 visual acuity in one eye needed corrective lenses, significantly more than the 7.4% observed in those with 20/20 vision in both eyes (relative risk 3.1, 95% confidence interval 2.2-4.3, p less than 0.0000). The prevalence of corrective lenses increased until age 26. We conclude that 7.4% of pilots will become myopic over a 10-year period if accepted with 20/20 vision in both eyes. The risk, however, is much higher in those with incipient growth myopia starting in one eye at entry. Therefore, the annual screening of visual acuity in air force personnel is essential.

Adolescent↗
PubMed1991

Intraocular lens in a fighter aircraft pilot.

A pseudophakic pilot of the Israeli air force flying an F-15 (Eagle) aircraft was followed up for three years. He experienced about 100 flying hours, 5% of the time under high g stress. The intraocular lens did not dislocate and no complications were observed. It seems that flying high performance fighter aircraft is not contraindicated in pseudophakic pilots.

Adult↗
PubMed1990

Amniotic fluid findings in women with high levels of chlamydial antibody.

A study was undertaken to examine possible transplacental passage of Chlamydia trachomatis from pregnant women who were seropositive for chlamydia, but with no cervical C. trachomatis infection. Forty asymptomatic pregnant women, scheduled for diagnostic amniocentesis at 15-19 weeks of gestation, were tested for the presence of high serum IgA and IgG chlamydial specific antibodies and for cervical chlamydia infection. Five (12.5%) had both high serum IgA and IgG antibody levels and 10 (25%) had high serum IgG antibody levels. Overall, 15 (37.5%) had high serum chlamydia specific antibody levels (all were free of cervical chlamydial infection). The evaluation of the amniotic fluid specimens of these 15 seropositive pregnant women, who were free of cervical chlamydial infection, proved negative for direct C. trachomatis antigen detection and for chlamydial IgA and IgG specific antibodies. These negative results could be attributed to the lack of transplacental passage of C. trachomatis or to the antimicrobial activity of amniotic fluid against C. trachomatis, which has been previously described. The discrepancy between maternal infection and maternal serum antibody levels may suggest that the serologic test does not predict the presence of an antigen in the cervix.

Adult↗
PubMed1979

Pterygium and basic tear secretion.

In order to investigate the correlation between the occurrence of pterygium and dryness of the eyes, a Schirmer's No. 1 test was done on both eyes in 60 patients with unilateral pterygia. No difference was found between the mean basic secretion of tears in the diseased eyes (15.33 +/- 8.09 mm) and the fellow eyes (15.65 +/- 7.89 mm), and both were in the normal range for this test. This data suggest that dryness of the eyes cannot be regarded as the cause of pterygium.

Adult↗
PubMed1978

A proposed pilocarpine therapeutic test.

For the pilocarpine therapeutic test that we have devised, one drop (0.1 ml) of 2% pilocarpine hydrochloride (an arbitrarily chosen concentration) is instilled in the glaucomatous eye to be treated, and the intraocular pressure is measured hourly for four hours. If the IOP does not fall below 24 mm Hg, which is our chosen pressure limit, the response is considered to be inadequate therapeutically. Our study showed that if an inadequate therapeutic response is obtained, initiation of treatment with 2% pilocarpine is not indicated, since in patients with such a response, continued treatment with 2% pilocarpine will be ineffective in controlling IOPs on subsequent clinical visits. In only those cases of patients with an adequate response to the pilocarpine therapeutic test (with a fall in pressure below 24 mm Hg) was there the likelihood of having the glaucoma controlled with continued 2% pilocarpine treatment.

Glaucoma↗
PubMed1977

Seroepidemiology of hepatitis B virus in Israel. Results of a pilot study in Jerusalem.

One thousand thirty-three native and immigrant Israelis, divided into 10-year age groups, were tested for the hepatitis B surface antigen (HBSAg) and antibody (anti-HBS). The prevalence of anti-HBS was 10.1%, increasing with age from the first (6.3%) through the fifth decade (16.2%) and declining slightly in the sixth and seventh decades. The age-adjusted prevalence of anti-HBS was higher for native Arabs (20.8%) compared with native Jews (4.8%), and for immigrants from North Africa (33.3%), compared with immigrants from the Middle and Near East (20.1%) and Western ("Ashkenazi") countries (8.5%). Acquisition of anti-HBS was not correlated with a past history of jaundice or of blood transfusion. Of the positive sera reactive for anti-HBS that were subtypable, 74% were anti-y and 26%, anti-d specific. The prevalence of HBSAg for the study population was 1.8%, resulting in a prevalence of hepatitis B virus (HBV) infection, past and present, of 11.9%. These findings indicate that, while HBV infection is prevalent in Jerusalem, the most common presentation is a non-icteric illness with an age distribution extending through early adulthood and not coinciding with the early childhood clustering characteristic of icteric hepatitis in the region. The serologic findings are consistent with other clinical and epidemiologic evidence that endemic hepatitis in Jerusalem is predominantly the result of infection by "non-B" viruses.

Adolescent↗