buphthalmos megalocornea and axial myopia (10%). NORMAL axial hyperopia. (80%) normal. (96%) axial myopia. (90%). SMALL small eye nanophthalmos.
IOL CALCULATION IN VERY SMALL EYES
José R.Villada Javier Martínez de Aragón Tatiana Villada
None of the authors have any finacial interest in any of the products mentioned
FOUR MAJOR CHALLENGES º POST REFRACTIVE SURGERY EYES º SIGNIFICANTLY IRREGULAR CORNEAE º EXTREMELY LONG EYES º EXTREMELY SHORT EYES
FOUR MAJOR CHALLENGES º POST REFRACTIVE SURGERY EYES º SIGNIFICANTLY IRREGULAR CORNEAE º EXTREMELY LONG EYES º EXTREMELY SHORT EYES
CURRENT IOL CALCULATION FORMULAE º 3rd GENERATION FORMULAE: use AL and K Holladay 1, SRK-T and Hoffer Q º 4th GENERATION FORMULAE use more parameters for IOL calculation Haigis, Olsen, Holladay 2
CALCULATION IN SMALL EYES axial length SHORT anterior segment size
LARGE
NORMAL
megalocornea megalocornea and axial (2%) hyperopia (0%)
NORMAL
axial hyperopia (80%)
SMALL
small eye nanophthalmos (20%)
normal (96%)
LONG buphthalmos megalocornea and axial myopia (10%)
axial myopia (90%)
microcornea microcornea and axial (2%) myopia (0%)
CALCULATION IN SMALL EYES axial length SHORT anterior segment size
LARGE
NORMAL
megalocornea megalocornea and axial (2%) hyperopia (0%)
NORMAL
axial hyperopia (80%)
SMALL
small eye nanophthalmos (20%)
normal (96%)
LONG buphthalmos megalocornea and axial myopia (10%)
axial myopia (90%)
microcornea microcornea and axial (2%) myopia (0%)
Mean Absolute Error (D)
FORMULA PERFORMANCE 6 5
Holladay 1
N = 997
4
Hoffer Q
3
SRK/T
2
Holladay 2
1 0 15
20
25
Axial Length (mm) 7/7/2006 JTH 6
30
STUDY DESIGN - retrospective review - inclusion criteria axial length
