Predictability for proper capsular tension ring size and intraocular lens size.
Predicting correct capsular tension ring size and intraocular lens size using measurements of lens diameter, corneal diameter, axial length and capsular bag diameters to determine anatomical relationships of post implantation capsular tension ring (CTR). The vertical and horizontal diameters of cornea and lens were measured in 62 human eyeballs supplied from the eye bank of the Catholic University. The relationship between corneal diameter and axial length was examined in 195 living human eyes. An extension of capsular bag diameter after implantation of CTR was measured in 19 pigs' eyes purchased from a slaughter house. The correlation between the lens diameter and the capsular bag diameter after CTR implantation was analyzed using linear regression. The average diameters (mean of horizontal and vertical diameters) of cornea and lens in human eyeball of postmortems (average age:69, ratio of male:female = 23:39) were 11.59+/-0.42 mm for horizontal diameter, 9.54+/-0.27 mm, for vertical diameter. The average corneal diameters and axial lengths in living human eyes (average age: 62, ration of male:female = 84:111) were 11.63+/-0.53 mm for the cornea diameter, 24.48+/-2.10 mm, for cornea axial length. There is a statistically significant correlation between corneal diameter and axial length (correlation coefficient=0.788; p<0.001) and corneal diameter and lens diameter (correlation coefficient=0.711; p<0.001). In pigs' eyes, there is a relationship between lens diameter and capsular bag diameter after implantation of 11 mm CTR (correlation coefficient=0.684; p<0.001). In conclusion, axial length and corneal diameter may give surgeons a valuable clue to expected size of capsular bag and important parameters for selecting the correct sized CTR and IOL.
Dong
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Laboratory of Ophthalmology and Visual Science, The Catholic University Medical Collage, Seoul, Korea.
Joo
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D000818:Animals; D000867:Anterior Chamber / Q000033:anatomy & histology; D003315:Cornea / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007903:Lens Capsule, Crystalline / Q000033:anatomy & histology; D019654:Lens Implantation, Intraocular; D007908:Lens, Crystalline / Q000033:anatomy & histology*; D007910:Lenses, Intraocular; D008297:Male; D013552:Swine