الفهرس 
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Abstract
Currently, cataract surgery is also considered a refractive surgery. The refractive outcome is not the only measure that determines the success of such surgeries. Low refractive errors with rapid stabilization also improve patient satisfaction and quality of life. To achieve the best level of vision following cataract surgery depends on the target refraction; eyeglasses or contact lenses may be needed. There are various factors to take into consideration when prescribing accurate glasses after cataract surgery, because this type of surgery reconstitutes the anatomy of the eye. The aim of the study is to assess the stabilization time of some ocular measurements after phacoemulsification, which are namely; error of refraction, corneal dioptric power, anterior chamber depth and central corneal thickness.
The study included 70 eyes of patients with immature senile cataract (nuclear grade I and II) visited Mansoura Ophthalmic Center over one-year period. Patients were not considered for this study if they had significant pathology that could influence the refraction such as: corneal, lens, and retinal pathology, uveitis, and patient with history of glaucoma or pervious ocular trauma. They were 26 males (37.1%) and 44 females (62.9%). The ages ranged from 52 to 73 years with mean ± SD of 58.77 ± 4.43 years. All patients submitted in the study undergone for complete ophthalmic examination, including uncorrected visual acuity, automated spherical and cylinder refraction using auto refractometer, best corrected visual acuity, slit lamp examination to assess the grade of cataract and angle of anterior chamber using gonio lens, fundus examination using indirect and direct ophthalmoscopy, intraocular pressure measurement by Schiotz tonometer, keratometry, anterior chamber depth, and central corneal thickness were measured. Comparison between preoperative and last follow-up examination ranged from 1 to 8 weeks as regard UCVA, BCVA, and refraction showed statistically highly significant difference (P<0.001). It was observed that visual acuity and refraction improved gradually and become stable by the third week postoperatively. There is insignificant difference in comparison between the 3rd week and 4th week and also between the 4th week and 8th week, which means that it became stable. On the other hand, cylinder axis and K-readings showed a non-significant difference (p >0.05). Comparison between preoperative and last follow-up period as regard CCT showed statistically insignificant difference (P<0.001). It was observed that CCT was elevated after surgery due to some corneal edema, then decreased gradually and most of the patients become stable in the first week and others become stable in the second week postoperatively. On the other hand, ACD showed highly significant increase in depth (p >0.05) in comparison between preoperatively and postoperative follow-up period. Conclusion : Following phacoemulsification the uncorrected, best corrected visual acuity and subsequently the refraction become stable by the third week postoperatively. On the other hand, cylinder power and K-readings showed a non-significant change. •CCT become stable in the second week and ACD become stable in the third week postoperatively.