EXHIBIT A

JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k) promulgated under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them a Statement on Schedule 13D and Schedule 13G (including amendments thereto) with regard to the common stock of TLC Vision Corporation, a Canada corporation, and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of August 14, 2007.

Highland Multi-Strategy Onshore Master SubFund, L.L.C.
By:	Highland Multi-Strategy Master Fund, L.P., its managing member
By:	Highland Multi-Strategy Fund GP, L.P., its general partner
By:	Highland Multi-Strategy Fund GP, L.L.C., its general partner
By:	Highland Capital Management, L.P., its sole member
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
		Name: James Dondero
		Title: President
Highland Multi-Strategy Master Fund, L.P.
By:	Highland Multi-Strategy Fund GP, L.P., its general partner
By:	Highland Multi-Strategy Fund GP, L.L.C., its general partner
By:	Highland Capital Management, L.P., its sole member
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
		Name: James Dondero
		Title: President
Highland Distressed Opportunities Fund, Inc.
By:	/s/ James Dondero
	Name: James Dondero
	Title: President
Highland Capital Management, L.P.
By:	Strand Advisors, Inc., its general partner
	By:	/s/ James Dondero
		Name: James Dondero
		Title: President
Strand Advisors, Inc.
By:
	/s/ James Dondero
	Name: James Dondero
	Title: President
James Dondero
/s/ James Dondero