Table of Contents - WOC 2012

WOC2012 Abstract Book
PO-CLR-09
Refractive Errors Among Medical Students in Saudi Arabia
Alotaibi Abdullah (1) , Alhathlool Rawabi (1) , Alqahtani Elham (1) , Alshehri Abdulaziz
(2)
1. King Saud University
2. king Saud Medical Complex
Aim: This study was conducted to determine the prevalence of various
refractive errors among Saudi medical students.
Methods: 194 senior medical students were examined to determine the
refractive errors. Cycloplegic refraction was performed using autorefractometer.
Spearman›s correlation and chi square were used for analysis.
Results: The average age was 22.3 years. 48.5% were males and 51.5% were
females. The prevalence rate of myopia in medical students was 70.6%.
About 30%of them had myopia of 2D or more. (44.3%) of the students were
using glasses and 13 of them (6.7%) were using contact lens. The second
most common refractive error was hyperopia with prevalence rate of 5.2%.
Astigmatism was found in 2% of the students. There was a significant
correlation between the age of onset of refractive error and the severity of
myopia(r:-0.31, p,0.0001).
Conclusions: More than two third of the Saudi medical students had some sort
of myopia. This prevalence rate of myopia represents one of the highest in the
world.
PO-CLR-10
Efficiency Evaluation of the Silicone-Hydrogel Contact Lenses in
Limbal Neovascularisation Recovery
Muskalski Krzysztof (1) , Dorecka Mariola (2) , Muskalska Anita (3) , Romaniuk
Dorota (2)
1. Alpha-Eye Contact Lens Center
2. Department of Ophthalmology, Medical University of Silesia
3. Medical University of Silesia, School of Medicine in Zabrze
Objective and Purpose: To evaluate efficiency of the silicone-hydrogel contact
lenses introduced in patients with limbal neovascularisation resulting of
prolonged hydrogel contact lenses wearing.
Methods: Silicone-hydrogel contact lenses were introduced in 56 patients with
limbal neovascularisation resulting of prolonged hydrogel contact lenses
wearing. The neovascularisation grade was evaluated using the Efron Grading
Scale for Contact Lens Complication. The follow-up was 2-5 years.
Results: Limbal neovasularisation decrease was observed in all patients.
Improvement range was related with silicone-hydrogel contact lens wear time
and contact lenses oxygen transmissibility (Dk/t) as well.
Conclusions: Silicone-hydrogel contact lenses are efficient in limbal
neovascularisation recovery. These lenses should be recommended in
hydrogel contact lenses wearers with limbal neovasularisation presence.
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PO-CLR-11
Contact Lenses in Keratoconus: Advantages and Limitations
Chaoui Zineb (1) , Imdary Imane (1) , Berraho Amina (1)
1. University of Medecine, ophthalmology department B, hospital specialties
Introduction: Contact lenses represent the principal means of correction of
keratoconus before surgical stage. This labour intends to consider the interests
of contact lenses.
Methods: We conducted a retrospective study of 200 records of patients with
keratoconus, followed between January 2000 and March 2011.
Results: 200 patients (390 eyes). Mean age is 24 years. Females represent
64%. Keratoconus was bilateral in 94%. Stage 3 (37%), stage 2 (33%), stage
4 (17%) and the first one 13%. Visual acuity with glasses was less than
3/10 in 44% of eyes. With contact lenses, visual acuity increased between
7/10 and 10/10 in 66%. Discussion Hard contact lenses are the correction
means of choice in keratoconus. There are a large number of geometries
specially adapted to the shape of the cone. However the adaptation faces
many difficulties in the advanced stages, making use of complex geometries
providing comfort to the port and acuity visually satisfactory. LRGP intolerance
can lead to the abandonment of the port.
Conclusion: The adaptation of keratoconus with contact lenses can get a
maximum quality of vision and good visual acuity, however, intolerance to the
lenses and the progression of keratoconus may make a surgery inevitable.
PO-CLR-13
Corneal Biometry and Axial Length in Posterior Microphthalmos
Nowilaty Sawsan R. (1) , Khan Arif O. (1) , Tabbara Khaled F. (2) , Al-Amri Abdullah
(1) (1)
, Jayar Hatem
1. King Khaled Eye Specialist Hospital
2. The Eye Center
Purpose: To assess corneal biometry & axial length in posterior microphthalmos
(high hyperopia, posterior chamber foreshortening, characteristic
papillomacular folds and normal-appearing anterior segment).
Methods: Prospective keratometry and biometry by IOLMaster (25 patients, 13
families).
Results: All patients (2-47 years, median 16) had features defined above. For
the right eye, mean cycloplegic refraction was +15.09 D (9.88-18.75). Corneal
power (mean 48.89 D [41.91-52.25]) and axial length (mean 16.25 mm [14.88-
19.88]) had strong inverse correlation (Pearson coefficient -0.88, p