The Los Angeles Business Journal’s index of largest local public companies gained strong for the week.

The weighted LABJ Stock Index rose 3 percent to $160.02 for the trading week ending April 12. Decliners outpaced gainers 113 to 51, with 7 companies unchanged.

Among the biggest gainers was Staar Surgical Co., jumping 19 percent to $6.41. The Monrovia maker of implantable lenses to correct vision forecast first quarter revenue growth that was better than Wall Street expected.

RealD Inc. rose 13 percent to $14.70. The Beverly Hills licensor of stereoscopic 3D technologies benefitted from upgrades by analysts who cited strong box-office sales from theaters using RealD’s technology.

Among the largest decliners was Cere Inc., down 14 percent to $3.03. The Thousand Oaks developer of genetically modified feedstocks for renewable energy production reported a disappointing fiscal second quarter.

Tetra Tech Inc, fell 11.5 percent to $25.45. The Pasadena engineering and technical service firm gave lower revenue projections for the second half of the year.