title: Why is the A-constant not a constant?
authors.forename: Maged S
authors.initials: MS
authors.lastname: Habib
authors.forename: Kaveri
authors.initials: K
authors.lastname: Mandal
authors.forename: Scott G
authors.initials: SG
authors.lastname: Fraser
authors.forename: Peter S
authors.initials: PS
authors.lastname: Phelan
mesh_terms: D001699:Biometry; D006801:Humans; D019654:Lens Implantation, Intraocular / Q000009:adverse effects; D007910:Lenses, Intraocular; D018918:Phacoemulsification / Q000009:adverse effects; D011183:Postoperative Complications; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000517:prevention & control*; D012086:Reoperation