Almeida, José B.

Fernandes, Paulo Rodrigues

González-Méijome, José Manuel

Jorge, Jorge

Parafita, Manuel A.

Queirós, A.

Universidade do Minho: RepositoriUM

56 EVER 2005 - Abstract bookPOSTER SESSION 2: Glaucoma, Lens and Cataract, Molecular Biology / Genetics / Epidemiology, Pathology / Oncologyπ 357Ocular components data in young adults and their correlation with the refractive errorQUEIROS A, GONZALEZ-MEIJOME J, JORGE J, FRANCO SPhysics (Optometry), BragaPurpose  e aim was to investigate the correlation between the refractive error and ocular components in a group of young adults.Methods  e exams were performed on 119 young adults (71.4% females) with a mean age of 23.2 ± 2.37 years. Axial ocular dimensions, including axial length (AL), anterior chamber depth (ACD), lens thickness (LT), and vitreous chamber depth (VCD) were measured using an A-scan ultrasound device. Corneal radius (CR) and eccentricity (CE) was measured with an autokeratometer.  e results obtained by the subjective distant refractive method with cycloplegia were used in the analysis and the refractive values were converted into spherical equivalents (SE) for some analysis. Myopia was defi ned as SE<=-0.50D, emmetropia as SE >-0.50D and <+0.50D and hyperopia as SE >=+0.50D.Results  e incidence of refractive errors was 26.9% miopes, 31.9% emmetropes and 41.2% hyperopes.  e refractive error of the sample, ranged from –9.75D to +2.00D, was –0.357 ±1.60D (mean±SD).  e maximum amount of astigmatism was –2.50D.  e AL, ACD, LT, VCD, CR, and CE values were 23.49±0.99mm (mean±SD), 3.59±0.26mm, 3.68±0.16mm, 16.21±0.92mm, 7.81±0.27mm and 0.49±0.11, respectively.   ere were found statistically signifi cant diff erences (p<0.001) between the three groups of refrac-tive error (M, E and H) for the AL, ACD, and VCD. For LT, CR, and CE there are no sig-nifi cant diff erences.A statistically signifi cant (p<0.001) correlation between the refrac-tive error and the ACD, VCD, and AL was found.Conclusion  e results show an incidence of refractive error similar to those obtained in other countries.  e ACD, VCD, and AL are the ocular components with the highest infl uence in the refractive error state.π 358An  automated system of measuring decentration of anterior seg-ment structures from  geometric central  axisASLAM T M (1), GUPTA A (1), ROSE C (2), CHARLES S J (1)(1) Royal Eye Hospital, Manchester(2) Department imaging science and biomedical engineering, Manchester University, ManchesterPurpose To develop and test a system of automated analysis of amount of decentration of anterior segment structures from a geometric axis defi ned either by pupil or limbal landmarks.  e system should be freely available and accessible for use without special-ised equipment. Methods  e system consisted of a computer  program developed using the Matlab programming platform.  Standard digital images of anterior segments were used by the program to make measurements.  e program code was also compiled for use on ma-chines without the Matlab platform.  e geometric central axis is computed based on ei-ther limbal or pupil structure, as defi ned by the user.   e  object to be measured is also defi ned by the user.  is object may be the pupil itself (to be measured relative to limbus) , crystalline lens, intraocular lens, corneal opacity, posterior capsule opacifi cation or oth-er anterior chamber body.  e amount of decentration and angle of decentration of the object is calculated.  e system was  tested for reliabiltiy and validity. Results   e compiled system is fully functional on PCs running Windows XP. It is eas-ily adaptable to assess decentration of a variety of structures using standard digital im-ages.  e reliability of the system was found to be high. Ample evidence for validity of the program was demonstrated. Conclusion  is paper presents as system of analysis of decentration of anterior seg-ment bodies that requires no specialised equipment.  e program and necessary fi les can be installed using the supplied software.  e system is shown to be extremely versa-tile , valid and reliable. It may be used clinically to track progress of  individual patients or as an objective measure for experimental studies.π 359Prospective Study on the Prevalence of Refractive Conditions in the North of PortugalQUEIROS A (1), JORGE J (1), GONZALEZ-MEIJOME J (1), FERNANDES P (1), ALMEIDA JB (1), PARAFITA MA (2)(1) Physics (Optometry), Braga(2) Surgery (Ophthalmology), Santiago de CompostelaPurpose  e purpose of this study was to report the fi rst estimations on the prevalence of refractive conditions in the Portuguese populationMethods  e fi les of an optometrist consultant in the north of Portugal were reviewed, and the report of 4288 patients who attended the clinic at least once is given; only the fi rst visit of each patient was considered. Results relate to spherical equivalent value un-der non-cycloplegic conditions. Values of non-cycloplegic refraction from the right eye were analyzed to estimate the prevalence of refractive conditions as a function of age and gender.  e prevalence of anisometropia and presbyopic correction as a function of age and gender were also investigatedResults A total of 4288 patients with a mean age of 40.08 ± 18.75 (mean ± SD). Mean spherical equivalent refractive error was - 0.29 ± 2.01 D, and no statistically signifi cant gender diff erences were found. A total of 29.8% of the sample had myopia, 45% had em-metropia and 25.2% had hyperopia. Young adults ranging from 20 to 35 years of age pre-sented the highest prevalence of myopia. Conversely, the peak of hyperopic condition was for the oldest population.  ere were not statistically signifi cantly diff erences be-tween presbyopic correction between males and females and both followed the classical models of presbyopic correction as a function of age.Conclusion  e prevalence of refractive conditions has been established for a repre-sentative group of the Portuguese population. Important refractive changes were evi-denced in the fi fth decade of life, comprising an increase in the prevalence of hyperopia along with a shift in the amount of astigmatismπ 360A Quick Look at the Lid Surgeries We DoRAVINDRANATHAN R, TAHHAN MOphthalmology, West BromwichPurpose Introduction:  e types of surgery and procedures done on the lid are many for the various conditions like entropion, ectropion, dermatochalasis, papilloma and basal cell carcinoma. We thought it would be interesting to look into our lid surger-ies and to note the results.Objectives: To study the outcome of various lid surgeries done at Sandwell Hospital between January 2001 and December 2002 on patients with Entropion, Ectropion and Dermatochalasis.Methods Setting: Sandwell General Hospital in West Midlands, United KingdomMethodology: Retrospective analysis of case notes- 41 cases. We obtained the names of the patients from the theatre register and analysed it retrospectively.  e fol-lowing data was collected : patient details, diagnosis, reason for surgery, type of surgery, grade of surgeon, complications, surgical outcome, recurrence of symptoms and repeat operations.  e number of male and female patients were 22 and 19 respectively.Results Results: Out of 41 cases, 29 had good surgical outcome. Out of 12 cases which had a poor outcome, 6 were previous recurrences. Poor outcomes included recurrenc-es, presence of notch and residual condition.  e most common case operated was Entropion. Quickert’s procedure was the most commonly done operation.Conclusion Conclusion: According to our research, it was found that patients with medial canthal laxity had poorer results. It was decided that such patients and those with a recurrence should be sent to the occuloplastic surgeons in the future.

Prospective study on the prevalence of refractive conditions in the north of Portugal

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Prospective study on the prevalence of refractive conditions in the north of Portugal

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