1 ERNST & YOUNG LLP LETTERHEAD August 12, 1999 Securities and Exchange Commission 450 Fifth Street, N.W. Washington, DC 20549 Gentlemen: We have read Item 4 of Form 8-K dated August 10, 1999, of Radiance Medical Systems, Inc. and are in agreement with the statements contained in the first and second paragraphs on page 2 therein. We have no basis to agree or disagree with other statements of the registrant contained therein. /s/ ERNST & YOUNG LLP ----------------------------------- ERNST & YOUNG LLP