What is the primary correction method for myopia?
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Correction strategies for myopia, hyperopia, astigmatism, and presbyopia, including glasses, contact lenses, and surgery.
This deck equips learners with a comprehensive understanding of the various correction methods for refractive errors, enabling informed decision-making for patient management and surgical planning in clinical practice.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What is the primary correction method for myopia? | Glasses with concave (minus) lenses are the primary correction method for myopia, as they diverge light rays to focus images properly on the retina. | Think 'minus' lenses for 'near-sighted' eyes. |
| 2 | How do convex lenses correct hyperopia? | Convex (plus) lenses converge light rays to help focus images directly on the retina, correcting hyperopia. | Convex = converging light, hyperopia = difficulty focusing on near objects. |
| 3 | What type of contact lens is commonly used to correct astigmatism? | Toric contact lenses are used to correct astigmatism as they have different powers in different meridians to correct irregular corneal curvature. | Toric lenses = tailored for irregular shapes. |
| 4 | Which surgical procedure is commonly performed to correct myopia and hyperopia? | Laser-assisted in situ keratomileusis (LASIK) is the most common surgical procedure to reshape the cornea and correct myopia and hyperopia. | LASIK = 'Laser-Assisted' correction. |
| 5 | What is presbyopia, and how is it typically corrected? | Presbyopia is age-related decline in accommodation leading to difficulty focusing on near objects, corrected with reading glasses or multifocal lenses. | Presbyopia = 'Old age vision change.' |
| 6 | Name a surgical option for presbyopia correction. | Presbyopia can be corrected surgically with procedures like monovision LASIK or corneal inlays to improve near vision. | Surgical monovision = one eye for distance, one for near. |
| 7 | What are the main advantages of contact lenses over glasses? | Contact lenses provide a wider field of vision, do not fog or get splattered, and are preferred in active or aesthetic contexts. | Advantages include mobility and aesthetics. |
| 8 | Describe the difference between rigid gas-permeable (RGP) and soft contact lenses. | RGP lenses are durable, provide sharper vision, and are suitable for irregular corneas, whereas soft lenses are more comfortable and easier to adapt to. | Rigid = sharper; soft = comfort. |
| 9 | What is orthokeratology (Ortho-K) and its purpose? | Orthokeratology involves wearing specially designed rigid contact lenses overnight to temporarily reshape the cornea and correct myopia. | Ortho-K = overnight corneal reshaping. |
| 10 | Which surgical procedure involves removing a corneal flap and reshaping the stroma? | LASIK involves creating a corneal flap and then using an excimer laser to reshape the underlying stroma. | LASIK = flap + laser reshaping. |
| 11 | What is photorefractive keratectomy (PRK), and how does it differ from LASIK? | PRK removes the corneal epithelium and reshapes the stroma without creating a flap, suitable for thinner corneas; LASIK involves creating a flap before reshaping. | PRK = surface ablation; LASIK = flap procedure. |
| 12 | What are the potential risks of refractive surgery? | Risks include dry eyes, glare, halos, under- or over-correction, infection, and in rare cases, loss of best-corrected vision. | Consider all risks before surgery. |
| 13 | When is contact lens use contraindicated? | Contact lens use is contraindicated in active eye infections, severe dry eye, or if the patient cannot maintain proper hygiene. | Infections and poor hygiene = no contact lenses. |
| 14 | What is the role of atropine drops in managing refractive errors? | Atropine drops are used to slow myopia progression in children by relaxing accommodation and reducing axial elongation. | Atropine slows myopia progression. |
| 15 | What is the main difference between hyperopia correction with glasses and contact lenses? | Both use convex lenses, but contact lenses offer a more natural field of view and less peripheral distortion. | Contact lenses = natural vision, glasses = peripheral distortion. |
| 16 | Which factor influences the choice between glasses and contact lenses for a patient? | Factors include patient age, lifestyle, corneal health, compliance, and personal preference. | Choose based on lifestyle and health. |
| 17 | How does astigmatism affect vision, and how is it corrected? | Astigmatism causes blurred or distorted vision due to irregular corneal or lens curvature, corrected with toric lenses or refractive surgery. | Irregular shape = blurred vision. |
| 18 | What are multifocal or bifocal glasses used for in refractive correction? | They are used to correct presbyopia by providing multiple focal points for near and distance vision. | Multifocal = multiple distances. |
| 19 | Can laser refractive surgery correct presbyopia? | Laser procedures can be combined with monovision or multifocal strategies to improve near vision in presbyopic patients, but they do not fully restore accommodation. | Partial correction, not true accommodation. |
| 20 | What is the concept of 'monovision' in refractive correction? | Monovision involves correcting one eye for distance and the other for near vision to reduce dependence on reading glasses. | One eye for each distance. |
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