1- 44^th Congress of the American Society of Cataract and Refractive Surgery,  Washington DC, April.2018.

2- 43^rd Congress of the American Society of Cataract and Refractive Surgery,  Los Angeles, May.2017.

3- 34^th Congress of the European Society of Cataract and Refractive Surgery,  London, Sep.2016.

4- 42^nd Congress of the American Society of Cataract and Refractive Surgery,  New Orleans, May.2016.

5- 33^rd Congress of the European Society of Cataract and Refractive Surgery,  Barcelona, Sep. 2015.

6- Annual Cornea Day (Organised by ESCRS and EuCornea), Feb. 2015.

7- 5^th EUCornea Congress,  London, Sep. 2014.

8- 32^th Congress of the European Society of Cataract and Refractive Surgery,  London, Sep. 2014.

9- World Ophthalmology Congeress, Tokyo, April. 2014.

10- 1^th Iranian Congress of Spritual Safety 2013, Shahd Beheshti University of Medical Sciences, Tehran, Dec. 2014.

11- 31^th Congress of the European Society of Cataract and Refractive Surgery,  Amesterdam, Oct. 2013.

12- 30^th Congress of the European Society of Cataract and Refractive Surgery,

Milan , Sep. 2012.

13- 29^th Congress of the European Society of Cataract and Refractive Surgery,       Vienna , Sep. 2011.

14- 1^th to 26^th  Iranian Congress of Ophthalmology, Tehran, 1990-2016.

 

15- 27^th Congress of the European Society of Cataract and Refractive Surgery,

 Barcelona , Sep. 2009.

 

16- 25^th Congress of the European Society of Cataract and Refractive Surgery,

 Stockholm, Sep. 2007. 

 

17- 24^th Congress of the European Society of Cataract and Refractive Surgery,

London, Sep. 2006.

 

18-  23^th Congress of the European Society of Cataract and Refractive Surgery, Lisbon, Sep. 2005.

 

19- 22^th Congress of the European Society of Cataract and Refractive Surgery, Paris France, Sep. 2004.

 

20- 6^th Annual NIDEK International Excimer Laser Symposium, Rio De Janeriro,

Brazil, Dec. 2000.

 

16- 6^th Annual NIDEK International Excimer Laser Symposium, Rio De Janeriro, Brazil, 8-9 Dec. 2000.