Purpose: To evaluate the results and safety profile of assistant medical officer ophthalmologists (AMO-O) performing cataract surgery in the last stage of their surgical training, before their appointment to local communities. Methods: We retrospectively analyzed the records of patients who underwent cataract surgery by AMO-Os at Dar es Salaam, Comprehensive Community Based Rehabilitation for Tanzania Disability Hospital between September 2008 and June 2011. Surgical options were either extracapsular cataract extraction (ECCE) or manual small incision cataract surgery (MSICS), both with polymethylmethacrylate intraocular lens implantation. Results: Four hundred and fourteen patients were included in the study. Two hundred and twenty-five (54%) underwent ECCE and 189 had MSICS. Mean logarithm of the minimum angle of resolution (logMAR) uncorrected visual acuity (UCVA) improved from 2.4 ± 0.6 preoperatively to 1.3 ± 0.8 1 week postoperatively (t-test, P < 0.001) and to 1.1 ± 0.7 3 months postoperatively (t-test, P < 0.001). Mean logMAR best-corrected visual acuity (BCVA) was 0.7 ± 0.5 1 week postoperatively and 0.6 ± 0.5 3 months postoperatively. There was no significant difference in mean logMAR UCVA (P = 0.7) and BCVA (P = 0.7) postoperatively between ECCE and MSICS. 89.5% achieved BCVA better than 6/60 and 57.3% better than 6/18 with a follow-up of 3 months. Posterior capsule rupture and/or vitreous loss occurred in 34/414 patients (8.2%) and was more frequent (P = 0.047) in patients undergoing ECCE (10.2%) compared with MSICS (5.3%). Conclusion: AMO-O cataract surgeons at the end of their training offer significant improvement in the visual acuity of their patients. Continuous monitoring of outcomes will guide further improvements in surgical skills and minimize complications.
Purpose To report the first case in the ophthalmic literature of acute anticholinergic syndrome after ingestion of Atropa belladonna mistaken for blueberries. Methods A 36-year-old woman presented to our ophthalmic emergency department with complaints of blurry vision, lightning flashes, disorientation, loss of balance, agitation, and anxiety for 24 hours. Ophthalmic examination revealed bilateral pupillary dilatation and paresis of accommodation. Additional symptoms of the anticholinergic syndrome were elicited on further questioning. Results Anticholinergic intoxication was suspected and the patient admitted to have eaten six “blueberries” found in the forest the previous day. The patient identified Atropa belladonna as the source of the berries she had eaten when shown photographs of the plant and its fruit. The recommendations of the Swiss Toxicological Information Centre were followed and physostigmine, the antidote for severe poisoning when 10 or more berries are ingested, was not administered. Conclusions Accidental ingestion of Atropa belladonna berries may cause patients to first consult an ophthalmologist. It is important to recognize the anticholinergic syndrome caused by such intoxication in order to make a proper diagnosis, avoid unnecessary testing, and provide expedient appropriate treatment when required.
Background: Cortical remapping after peripheral or central visual deafferentation alters visual perception, but it is unclear whether such a phenomenon impinges on areas remote from a scotoma. To investigate this question, we studied variations of perceptual spatial distortion in the visual field of patients with homonymous paracentral scotoma. Methods: Two patients with right inferior homonymous paracentral scotoma were asked to describe their perception of a series of figures showing two isometric vertical lines symmetrically located on either side of a fixation point. In each figure, the fixation point varied by steps of 2° along a hypothetical vertical line equidistant between the test lines. The lines subtended 20° of visual angle, and the right line passed through the scotoma in both cases. Time for spatial distortion to manifest was recorded. Results: Both subjects reported that the right line was perceived as shorter than the left one. The line shortening varied in magnitude with the distance of the fixation point from the end of the line and was more pronounced when the distance increased. Moreover, perceptual line shortening appeared 5-10 seconds after steady fixation, but values of shortening varied during the following 10 seconds. In addition, the right line appeared uninterrupted or slightly blurred in the scotoma region. Conclusions: These observations reflect long-range cortical reorganization after brain damage. Larger receptive fields in the periphery of the visual map could explain why perceptual shortening is more pronounced with increased eccentricity.
“Closed” intraocular surgery is characterised by some degree of pressurisation of the globe, positive intraocular pressure, during almost all of the procedure so the eye is not markedly hypotenous more than momentarily. In closed surgery characteristically, the incisions are self sealing or small and easily closed with suturing, and second, the eye is pressurised by an infusion line.1 Phacoemulsification2 and trans pars plana vitrectomy3 are typical forms of closed intraocular surgery.
“Open” intraocular surgery4 is characterised by globe decompression to or close to atmospheric pressure for significant periods of time, typically with an incision which is not self sealing, such as nuclear expression extracapsular cataract surgery, penetrating keratoplasty and trabeculectomy.
1. What is positive vitreous pressure?
2. How is the choice of anaesthetic technique affected by whether intraocular surgery is closed or open?
3. What are the consequences of converting from closed to open surgery, specifically from phacoemulsification to nuclear expression?
See page 1413 for answers
From questions on page 1400
1. “Positive vitreous pressure” (PVP)4 5 is apparent pressure forward against the lens-iris diaphragm from the vitreous, movement of the vitreous body anteriorly during intraocular surgery. PVP does not arise from any inherent expansile force generated within the vitreous body nor from elastic forces of …
The aim of the study was to assess the value of the ophthalmological independent medical examination (IME) for detecting malingering, exaggerated or feigned symptoms, and incorrect causal relationship.Retrospective observational cohort study.Consecutive examinees (n = 344) who underwent an IME by a single examiner between 1998 and 2005 in the setting of an ophthalmological group practice were included in the study. Diagnoses were made to at least a degree of medical certainty. Main outcome measures were frequency of exaggerated, feigned and non-causally related pathology and symptoms.In 172 claimants (50%), the symptoms and pathology claimed were fully substantiated. The other 172 claimants were found to have either exaggerated or totally feigned symptoms and/or symptoms and pathology misattributed (non-causally related to the claimed accident or incident). The most frequent feigned/exaggerated symptoms were visual loss (74%), ocular pain/discomfort (28%), visual field loss (19%), headaches (17%) and photophobia (13%). Visual field loss and the symptoms of ocular discomfort, headaches, dizziness and epiphora were more frequent in the feigning group (p<0.01). In contrast, complaints of swelling and deformity were more frequent (p = 0.001) among the examinees with real pathology. Review of the medical records provided helpful information in 163/172 cases in the feigning group.An ophthalmological IME is useful for detecting malingering, as well as symptoms and pathology not causally related to a claimed accident or injury or actually pre-existent to a claimed date. The advantages of an IME compared with relying on treating-doctor records, clues for diagnosing feigning and incorrect causal relationship, and guidelines for performing an ophthalmological IME are discussed.
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