Ophthalmology meaning
Ophthalmology is the branch of medicine and surgery that deals with the diagnosis and treatment of eye disorders. Ophthalmologists are medical doctors who specialize in eye and vision care, performing eye exams, prescribing corrective lenses, diagnosing and treating eye diseases such as glaucoma, cataracts, macular degeneration, and diabetic retinopathy, and performing eye surgeries. They also manage eye injuries and provide care for patients with vision impairments. Ophthalmology involves both medical and surgical expertise, aiming to preserve and restore vision and improve patients' overall eye health.
Ophthalmology meaning: Explanation, Formulae and Practice
These topics connect maths with money decisions. Always identify cost price, selling price, principal, rate and time before using a formula.
Practical Formulae
- Profit = selling price - cost price.
- Loss = cost price - selling price.
- Profit percentage = (profit / cost price) x 100.
- Simple interest = (principal x rate x time) / 100.
- Amount = principal + interest.
Solved Example
Question: An item is bought for Rs. 500 and sold for Rs. 575. Find the profit percentage.
Working: Profit = 575 - 500 = 75. Profit percentage = (75 / 500) x 100.
Result: Profit percentage = 15%.
Unanswered Practice Questions
Try these yourself before checking notes or calculators.
- Find the loss percentage when CP is Rs. 800 and SP is Rs. 720.
- Find simple interest on Rs. 5,000 at 8% per year for 2 years.
- A shopkeeper marks an item at Rs. 1,200 and gives 10% discount. Find the selling price.
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