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terminology and guidelines for glaucoma ii - Kwaliteitskoepel

terminology and guidelines for glaucoma ii - Kwaliteitskoepel

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- Weaknesses<br />

Limited IOP range<br />

Patients with advanced disease (≥16 Db) were excluded<br />

Limited treatment options<br />

High sensitivity of method <strong>for</strong> assessing progression may have reduced specificity<br />

II. 6 - CLINICALLY USEFUL POINTS FROM THESE STUDIES<br />

II. 6. 1 - from OHTS<br />

1. 90% of OHT did not convert in 5 years, raising the ‘need to treat’ question.<br />

2. Treatment is effective: of the approximately 10% that converted half could be prevented by the OHTS treatment.<br />

We do not know how much longer this treatment prevents further conversion.<br />

3. It did not tell us what treatment would reduce the number of converters to close to zero.<br />

4. The majority of conversion was based on ONH change: monitoring of the optic disc is essential <strong>for</strong> follow-up of<br />

OHT next to visual field. Will all disc changes eventually lead to significant visual field defects<br />

5. Conversion based on optic disc / RNFL changes (OHTS) may come be<strong>for</strong>e white/white VF changes.<br />

6. Results on alternative methods <strong>for</strong> discovery of earlier visual function disturbances have not - yet - been published<br />

by OHTS. Preliminary SWAP analysis suggested that a proporton had VF defects at entry; this plus the suggestion<br />

of pre-existing disc change says that many already could have had POAG.<br />

7. At a mean treated IOP level of 19.3 mmHg, 4.4% reached the endpoint. Delta IOP was 4.6 mmHg (

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