[12]  Id. at 57.  Id. at 14. [14]  GSIS v. Cuanang, G.R. No. 158846, June 3, 2004, 430 SCRA 639, 648. [15]  Loyola v. GSIS, G.R. No. 89097, August 24, 1990, 189 SCRA 82, 85. [16]  GSIS v. Court of Appeals, 417 Phil. 102, 109 (2001). [17]  Castor-Garupa v. ECC, G.R. No. 158268, April 12, 2006 and GSIS v. Valenciano, G.R. No. 168821, April 10, 2006. [18]  GSIS v. Cuanang, Supra note 14 at 646, citing Philippine Transmarine Carriers, Inc. v. NLRC, G.R. No. 123891, February 28, 2001, 353 SCRA 47, 53. [19]  Raro v. ECC, G.R. No. 58445, April 27, 1989, 172 SCRA 845, 849, as cited in Orate v. Court of Appeals, 447 Phil 654, 666 (2003); Rio v. Employees Compensation Commission, 387 Phil. 612, 620 (2000); Librea v. ECC, G.R. No. 58879, March 6, 1992, 207 SCRA 45, 48; and Sante v. Employees Compensation Commission, G.R. No. 84415, June 29, 1989, 174 SCRA 557, 562. [20]  http://www.medicinenet.com/glaucoma/page2.htm (visited on September 7, 2007); http://www.webmd.com/eyehealth/glaucoma-eyes?page=2&print=true (visited on September 7, 2007); http://www.docshop.com/education/vision/eye-diseases/glaucoma/causes (visited on September 7, 2007); http://www.mayoclinic.com/print/glaucoma/DS00283/DSECTION=all& METHOD=print (visited on September 5, 2007);http://www.nlm.nih.gov/medlineplus/print/ency/ article/001620.htm. (visited on September 5, 2007); http://www.umm.edu/ency/article/001620.htm (visited on September 5, 2007) ;http:// www.emedicine.com/oph/byname/glaucoma-primary-open-angle.htm (visited on September 5, 2007); and http://www.visionrx.com/library/enc/enc_ oaglaucoma.asp?print=1& (visited on September 5, 2007). [21]  Supra note 19 at 565. [22]  357 Phil. 511 (1998). [23]  Id. at 529-530. [13]