Posters

The use of ultrasound biomicroscopy (UBM) in the learning of the stable position of toric intraocular lenses (tIOL) AcrySof Toric (Alcon, USA) in patients with corneal astigmatism after phacoemulsification cataract surgery

Poster Details

First Author: G.Fediashev RUSSIA

Co Author(s):    D. Negodina                    

Abstract Details

Purpose:

The analysis of tIOL's rotational stability after phacoemulsification, the detection of changies between eye's anterior segment structures and IOL's parts and the finding of objective UBM evidences of rotational IOL instability.

Setting:

Primorsky center of Eye Microsurgery, Ltd,Vladivostok, Russia.

Methods:

Acrysof Toric IOLs were implanted in 42 patients (58 eyes) having regular corneal astigmatism between 1,0 and 4,5 D during phacoemulsification. The angle of IOL's rotational deviation was assessed on 1st, 7th,30th days and 3rd, 6th months - postoperative periods by digital photography with Image J computer program processing (http:rsb.info.nih.gov/ij/). At the same time, the diameter of capsulorhexis and capsular bag, lens capsule thickness, the "IOL's optical part-scleral spur" distance and the "iris- the edge of IOL optical part" were measured by "Accutome UBM plus" (USA). The statistical processing of the results was made with computer programm SPSS Statistics 19.

Results:

There was no correlation between lens's capsule thickness and angle of tIOL's rotation instability (r = 0,02-0,06). The size of capsulorhexis declined in average on 0,85+/- 0,32 mm (from 6,03 to 5,13 mm) during the investigation. There was no direct lineal link between degree of capsulorhexis size decrease and the angle of tIOL rotational deviation (r = 0,02). During the investigation the "scleral spur- the IOL's optical part edge" distance rised about on 0,29+/- 0,05 mm (from 3,37 to 3,66 mm). There was direct correlation of the angle rotation instability with the "scleral spur- the IOL's optical part edge" distance.

Conclusions:

The rotational instability of tIOL has dirrect correlation with angle of tIOL's optical part deviation as dinamical increase of the "scleral spur- the IOL's optical part edge" distance and the "iris- the edge of IOL optical part". Thus, it is possible to reveal the evidences of tIOL's rotational instability while the optical axis of tIOL is in central position. The decline of capsulorhexis sizes does not have direct lineal link with increase of the IOL's Acrysof Toric rotational angle, as can be possible result of mobile connection between optical and gaptical parts of IOL.

Financial Disclosure:

NONE