Intraocular lens power prediction in a vietnamese population. A study to establish a limited set of intraocular lens powers that could be used in a vietnamese population.
OBJECTIVE
To determine a range of dioptric powers for Intraocular Lenses (IOLs) that would cover at least 95% of the Vietnamese population attending hospital for cataract removal and IOL implantation.


OBJECTIVE
To determine the ocular axial lengths and keratometric powers of people attending for cataract surgery at a hospital in Vietnam and hence predict the intraocular lens powers required for emmetropia for this population.


OBJECTIVE
95% of the population attending a Vietnamese hospital for cataract and intraocular lens surgery would be within +/- 4.5 dioptres of the mean predicted emmetropic intraocular lens power.


METHODS
A case series.


METHODS
Axial length, keratometric power, age, sex, preoperative refractive status, preoperative vision, ethnicity.


RESULTS
Intraocular lens power for emmetropia.


RESULTS
346 adults attending for cataract surgery at the Hue Central Hospital, Vietnam were examined. The mean axial length was found to be 22.96 mm +/- 0. 99 (range 20.37-27.25), median 23.01 mm. The mean corneal power was 44.24 dioptres +/- 1.53 (range 39.50-49.00), median 44.5 dioptres. Using the SRK/T formula, with an "A" constant of 118.3, the mean predicted intraocular lens power required for emmetropia was 21.44 dioptres +/- 2.77 (range 10.87-27.25), median 21.56 dioptres. The mean predicted IOL power for females was 21.94 dioptres +/- 2.60 (range 13.84-29.68), median 22.13 dioptres. The mean predicted IOL power for males was 20.72 dioptres +/- 2.84 (range 10.87-28.95), median 20.66 dioptres. conclusion 95% of the population attending for cataract surgery were within 5.5 dioptres of the mean predicted emmetropic IOL power.
La Nauze
J
J
The Fred Hollows Foundation Sydney, Australia. lanauze@albury.net.au
Kim Thanh
T
T
Dinh Lap
T
T
Anh Tai
N
N
Thi Nhat Chau
N
N
Ngoc Chuong
H
H
Van Nam
P
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003315:Cornea / Q000033:anatomy & histology*; D005123:Eye / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007910:Lenses, Intraocular; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D055095:Optics and Photonics; D012029:Refraction, Ocular / Q000502:physiology; D012030:Refractive Errors / Q000208:ethnology / Q000628:therapy; D012189:Retrospective Studies; D014744:Vietnam; D014792:Visual Acuity